Independent Component Reference

Pressure Washer Spray Gun

Pressure, temperature, flow and both connections define the spray-gun approval boundary.

This profile compares official consumer, professional and recoil-assisted spray-gun families without treating a common connector appearance as universal fit.

Included

Consumer and professional pressure-washer trigger guns
Cold- and hot-water operating envelopes
Hose, lance, quick-connect and threaded interface checks

Excluded

Airless paint spray guns
Garden-hose nozzles
Unapproved field modification of pressure-bearing parts

First published 2026-08-11 · Last verified 2026-08-11

Physical resemblance, matching wattage, matching voltage, a generic family name or a seller claim does not establish compatibility. Verify the current manufacturer part number and revision, machine model and serial scope, mechanical, electrical and fluid interfaces, rated operating envelope, protection requirements and approved service documentation.

Simpson universal pressure washer spray gun 80147 — Official Simpson 80147 product image on a WCB canvas; use the current product page for its cold-water and connection scope. Official image source

Pressure Washer Spray Gun key facts
Fact	Technical reference	Scope boundary
Rated envelope	Official families publish different pressure, flow and temperature limits	Named official product, model, market and document edition only; verify the current revision before procurement.
Interface boundary	Inlet and outlet thread or quick-connect systems must both match	Named official product, model, market and document edition only; verify the current revision before procurement.
Operator control	Trigger geometry, safety lock and valve design are model-specific	Named official product, model, market and document edition only; verify the current revision before procurement.

Functional boundary

Where the component sits in the larger system

This WCB flow describes documented functions, not one universal product construction.

01
Flow isolation
The internal valve starts and stops high-pressure flow.
EvidenceThe cited official source supports this statement within its named product or document scope.
ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.
Verified2026-08-11
Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup
02
Operator control
The trigger, guard and safety lock provide the manual control interface.
EvidenceThe cited official source supports this statement within its named product or document scope.
ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.
Verified2026-08-11
Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup
03
Pressure transfer
The body and seals retain the rated pressure and temperature.
EvidenceThe cited official source supports this statement within its named product or document scope.
ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.
Verified2026-08-11
Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup
04
System connection
Inlet and outlet join the hose, lance and approved accessory system.
EvidenceThe cited official source supports this statement within its named product or document scope.
ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.
Verified2026-08-11
Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Architecture families

Different component architectures solve different constraints

No architecture is a universal winner, and a family label is not a replacement-part specification.

Simpson 80147 trigger gun assembly — Official technical image
Official Simpson product image showing the trigger body, guard and connection ends.
**How to use this visual**Use the photographed family only to understand documented construction context; do not infer exact product fit.
Official image source

Consumer M22 trigger gun

Principle: A conventional trigger valve connects common named hose and lance interfaces.
Application boundary: Cold-water machines inside the stated rating
Benefits: Simple replacement path
Limitations: M22 dimensions and adapter scope still vary
Buyer check: Confirm the exact part number, installed system, interface and documented operating envelope.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Professional hot-water gun

Principle: Higher-rated valve, body and seals support a documented hot-water envelope.
Application boundary: Professional systems within exact pressure, flow and temperature ratings
Benefits: Higher duty and temperature range
Limitations: Heavier and connection-specific
Buyer check: Confirm the exact part number, installed system, interface and documented operating envelope.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Recoil-assisted ergonomic gun

Principle: System recoil force or an easy-pull mechanism reduces sustained finger load.
Application boundary: Named professional system and connector family
Benefits: Reduced operator strain
Limitations: Not a universal retrofit across connector systems
Buyer check: Confirm the exact part number, installed system, interface and documented operating envelope.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Specification dictionary

What component specifications do—and do not—mean

Pressure Washer Spray Gun specification dictionary
Specification	Purchasing meaning	Reporting boundary	Comparison caution
Maximum pressure	Defines the documented operating ceiling	Retain working/maximum terminology and unit	Do not size from machine marketing pressure alone.
Maximum flow	Defines valve and passage capacity	Retain stated GPM or L/min condition	Higher pressure does not imply adequate flow.
Maximum temperature	Separates cold- and hot-water service	Confirm water and ambient boundary	A cold-water gun is not approved by similar appearance.
Inlet and outlet	Defines hose and lance integration	Record thread gender, size and quick-connect parts	M22 or QC labels alone may omit critical dimensions.

Pressure Washer Spray Gun performance reporting boundary diagram — WCB explanatory visual
WCB reporting map: compare ratings only inside the same documented part, condition, unit and machine scope.
**How to use this visual**Keep every reported value inside its stated unit, operating point, test method and product scope.
**Diagram sources**simpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup, karcher-easyforce

Maximum pressure evidence

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Maximum flow evidence

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Maximum temperature evidence

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Inlet and outlet evidence

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Evidence + WCB interpretation

Application matrix

Official application language narrows the review; it does not prove exact product fit.

Simpson 80148 spray gun with side assist handle — Official technical image
Official Simpson callout image on a WCB canvas; the named page limits this cold-water gun by pressure, flow and M22 connections.
**How to use this visual**Treat the photographed application as source context only. Verify the actual operating point, duty, envelope and approvals.
Official image source

Residential cold-water cleaning

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

WCB assessment

Use a cold-water gun within the machine pressure, flow and M22/QC scope.

Basis: Official architecture and application statements from the cited sources.
Limitations: No exact machine or floor suitability is established outside the cited scope.
Buyer action: Approve the exact part, machine/head and operating procedure.

Commercial hot-water cleaning

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

WCB assessment

Use a professional gun whose exact temperature, pressure and seal scope is documented.

Basis: Official architecture and application statements from the cited sources.
Limitations: No exact machine or floor suitability is established outside the cited scope.
Buyer action: Approve the exact part, machine/head and operating procedure.

Extended professional operation

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

WCB assessment

Evaluate easy-pull or recoil-assisted ergonomics only inside the approved system.

Basis: Official architecture and application statements from the cited sources.
Limitations: No exact machine or floor suitability is established outside the cited scope.
Buyer action: Approve the exact part, machine/head and operating procedure.

Compatibility gate

Family similarity is not replacement compatibility

Physical resemblance, group ownership, generic family names, seller claims, and matching wattage do not establish compatibility.

Pressure Washer Spray Gun compatibility approval gate — WCB explanatory visual
WCB compatibility gate: stop approval when identity, interface, rating or source scope remains undocumented.
**How to use this visual**Pass every relevant gate using current manufacturer documents before approving a substitute, service part or design change.
**Diagram sources**simpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup, karcher-easyforce

Pressure and flow

Required match: Gun ratings at least cover the approved machine operating point
Why it matters: A pressure-only match can overload flow passages.
Required action: Record manufacturer evidence for every required field before approval.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Temperature

Required match: Cold- or hot-water rating and seal material scope
Why it matters: Heat can invalidate a cold-water assembly.
Required action: Record manufacturer evidence for every required field before approval.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Connections

Required match: Exact inlet/outlet thread, gender, QC plug and adapter
Why it matters: Visual similarity does not establish sealing or retention.
Required action: Record manufacturer evidence for every required field before approval.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Safety and ergonomics

Required match: Trigger lock, guard, recoil behavior and lance support
Why it matters: Control behavior affects safe operation.
Required action: Record manufacturer evidence for every required field before approval.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Service boundary

Failure signals and required checks

Symptoms narrow inspection work; they are not a remote diagnosis or repair instruction.

Gun leaks while closed

WCB inspection categories

Valve-seat debris
Worn seal or incorrect fitting

Safety boundaryDepressurize and isolate the machine before inspection.

Service actionUse the current manufacturer inspection, maintenance and replacement procedure.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Trigger will not operate

WCB inspection categories

Safety lock engaged
Valve or pressure-system fault

Safety boundaryDo not defeat the trigger lock or modify the valve.

Service actionUse the current manufacturer inspection, maintenance and replacement procedure.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Connection ejects or seeps

WCB inspection categories

Wrong fitting
Damaged O-ring or over-rating

Safety boundaryStop operation immediately and follow the official service procedure.

Service actionUse the current manufacturer inspection, maintenance and replacement procedure.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Representative, not exhaustive

Official representative product families

These rows document manufacturer-published families. They do not establish a customer, OEM, factory or compatibility relationship.

Representative official component families
Manufacturer	Family	Architecture	Declared application	Distinguishing specifications	Scope
Simpson	80147 Universal Spray Gun	Cold-water conventional trigger gun	Named compatible residential pressure-washer scope	Official family identityNamed architecture or operating envelope	Simpson US
Simpson	80148 Side Assist Handle	Cold-water M22 gun with rotating assist handle	Machines within named rating and M22 scope	Official family identityNamed architecture or operating envelope	Simpson US
Simpson	80178 Professional Spray Gun	Hot/cold professional gun with adapters	Up to the exact published pressure, flow and temperature	Official family identityNamed architecture or operating envelope	Simpson US
MTM Hydro	SGS28 10.5007	Easy-pull gun with live swivel	4000 PSI, 12 GPM named configuration	Official family identityNamed architecture or operating envelope	MTM Hydro US
MTM Hydro	SG35 10.0342	5000 PSI conventional professional gun	Named 12 GPM and 320°F family	Official family identityNamed architecture or operating envelope	MTM official lineup
Kärcher	EASY!Force Advanced 4.118-005.0	Recoil-assisted professional trigger gun	Named EASY!Lock professional systems	Official family identityNamed architecture or operating envelope	Kärcher US
Kärcher	EASY!Force technology family	Recoil-force trigger architecture	Named Kärcher professional application	Official family identityNamed architecture or operating envelope	Kärcher US

WCB decision support

Procurement decision matrix

WCB assessment

OEM or approved service replacement

Verify: Exact part identity, revision and installed system
Comparison trap: Treating a family label as an exact fit
Assessment: Requires application-specific verification.
Basis: Official part and model scope.
Limitations: No fit is established outside the named source scope.
Buyer action: Require current manufacturer cross-reference or approved-parts evidence.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

WCB assessment

Alternative sourcing qualification

Verify: Geometry, materials, interfaces, ratings and validation plan
Comparison trap: Approving by photo, nominal size or one matching rating
Assessment: Requires application-specific verification.
Basis: Multiple official families show different architecture and limits.
Limitations: Public sources do not qualify an unlisted substitute.
Buyer action: Run documented engineering, safety and service validation before approval.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

WCB assessment

Application selection

Verify: Machine, surface, duty and operating condition
Comparison trap: Comparing headline performance outside its test boundary
Assessment: Requires application-specific verification.
Basis: Official application and technical documents.
Limitations: Field results vary with the complete system and procedure.
Buyer action: Approve the complete operating specification and acceptance test.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Engineering validation

Checks before approval or substitution

Pressure and flow

A pressure-only match can overload flow passages.

Required actionFreeze the approved value, tolerance, evidence URL and revision in the procurement specification.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Temperature

Heat can invalidate a cold-water assembly.

Required actionFreeze the approved value, tolerance, evidence URL and revision in the procurement specification.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Connections

Visual similarity does not establish sealing or retention.

Required actionFreeze the approved value, tolerance, evidence URL and revision in the procurement specification.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Safety and ergonomics

Control behavior affects safe operation.

Required actionFreeze the approved value, tolerance, evidence URL and revision in the procurement specification.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcessimpson-80147, simpson-80148, simpson-80178, mtm-sgs28, mtm-lineup

Standards boundary

Safety and performance references

IEC 60335-2-79

JurisdictionInternational

Version2021

ApplicabilitySafety context for high-pressure cleaners within the standard scope; not a spray-gun compatibility or certification claim.

EvidenceThe cited official source supports this statement within its named product or document scope.

ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.

Verified2026-08-11

Sourcesiec-60335-2-79

Technical developments

Documented changes affecting design or procurement

2026-08-11
Official product ranges document multiple gun architectures
Reviewed Simpson, MTM Hydro and Kärcher sources distinguish cold-water, hot-water and recoil-assisted designs with different operating envelopes.
EvidenceThe cited official source supports this statement within its named product or document scope.
ScopeNamed official product, model, market and document edition only; verify the current revision before procurement.
Verified2026-08-11
Sourcessimpson-80178, mtm-lineup, karcher-easyforce

Audit trail

Primary and technical sources

Last material modification 2026-08-11 · Last verified 2026-08-11

manufacturer
Universal Pressure Washer Spray Gun 80147
Simpson
Accessed 2026-08-11
Open source
manufacturer
Universal Pressure Washer Spray Gun with Side Assist Handle 80148
Simpson
Accessed 2026-08-11
Open source
manufacturer
Professional Pressure Washer Spray Gun 80178
Simpson
Accessed 2026-08-11
Open source
datasheet
MTM Hydro SGS28 Spray Gun
MTM Hydro
Accessed 2026-08-11
Open source
manufacturer
Official MTM Hydro spray-gun lineup
MTM Hydro
Accessed 2026-08-11
Open source
manufacturer
EASY!Force Advanced pressure washer trigger gun 4.118-005.0
Kärcher
Accessed 2026-08-11
Open source
technical
EASY!Force trigger-gun technology
Kärcher
Accessed 2026-08-11
Open source
standard
IEC 60335-2-79:2021 high-pressure cleaner safety
IEC
Accessed 2026-08-11
Open source

Pressure Washer Spray Gun

Flow isolation

Operator control

Pressure transfer

System connection

Consumer M22 trigger gun

Professional hot-water gun

Recoil-assisted ergonomic gun

Residential cold-water cleaning

Commercial hot-water cleaning

Extended professional operation

Pressure and flow

Temperature

Connections

Safety and ergonomics

Gun leaks while closed

Trigger will not operate

Connection ejects or seeps

OEM or approved service replacement

Alternative sourcing qualification

Application selection

Pressure and flow

Temperature

Connections

Safety and ergonomics

IEC 60335-2-79

Official product ranges document multiple gun architectures

Universal Pressure Washer Spray Gun 80147

Universal Pressure Washer Spray Gun with Side Assist Handle 80148

Professional Pressure Washer Spray Gun 80178

MTM Hydro SGS28 Spray Gun

Official MTM Hydro spray-gun lineup

EASY!Force Advanced pressure washer trigger gun 4.118-005.0

EASY!Force trigger-gun technology

IEC 60335-2-79:2021 high-pressure cleaner safety