SIMPSON 5075 PSI Hot Water Pressure Washer Gun 80178 — Universal Fit, 212°F Rated, M22/Quick-Connect

The SIMPSON 5075 PSI Hot Water Pressure Washer Gun (model 80178) is a universal replacement spray gun built for hot- and cold-water pressure washers up to 5075 PSI and 12.0 GPM.

This heavy-duty replacement spray gun from SIMPSON is engineered for professionals and weekend warriors who need a durable, comfortable trigger gun that handles high pressure and heat. It ships with both M22 and quick-connect adaptors so it connects to most high-pressure hoses and wands. The pistol-style body and easy-pull trigger reduce hand fatigue during extended cleaning jobs, while the integrated safety lock helps prevent accidental spraying.

How does this spray gun handle hot-water pressure washing?

The SIMPSON 80178 is rated for temperatures up to 212°F and built to withstand hot-water cleaning tasks without premature wear. Internal components and seals are selected for thermal stability so you can use the gun on hot-water-capable units safely within the stated limits.

• Maximum temperature: 212°F (100°C)
• Designed components for hot-water compatibility
• Safe for hot-water residential and light commercial machines

Will it fit my pressure washer and accessories?

This spray gun offers a universal fit to minimize compatibility issues: it features a 3/8" FNPT inlet and a 1/4" FNPT outlet and comes with both an M22 threaded adaptor and a quick-connect (QC) adaptor. Those adaptors let you hook up to most hoses and wands commonly used on gas-powered pressure washers.

• Inlet: 3/8" FNPT thread
• Outlet: 1/4" FNPT lance/wand thread
• Includes M22 high-pressure hose adaptor and a 3/8" QC inlet adaptor

What pressure and flow specs should I expect?

The gun is rated to handle pressures up to 5075 PSI and flows as high as 12.0 GPM, making it suitable for heavy-duty cleaning jobs when matched to an appropriately spec'd pressure washer. Always verify your machine’s maximum PSI/GPM to ensure safe operation and to avoid exceeding component ratings.

• Maximum PSI: 5075
• Maximum flow: 12.0 GPM
• Use only within the specified PSI/GPM and temperature limits

What convenience and safety features are included?

The ergonomically contoured handle and easy-pull trigger reduce user fatigue during long shifts, while an integrated safety lock helps prevent accidental discharge. The construction balances durability with operator comfort for both residential and commercial use.

• Ergonomic pistol grip for reduced hand strain
• Easy-pull trigger with safety lock-out
• Durable build suitable for frequent use

Who is this for: The SIMPSON 5075 PSI Hot Water Pressure Washer Gun (80178) fits homeowners, mobile detailers, contractors, and small-business operators who need a reliable, heat-rated replacement or upgrade gun that connects to common hoses and wands. Choose this model if your pressure washer runs hot or you require high-pressure capability with quick-connect convenience and a comfortable working grip.