The Simpson Replacement Spray Gun is for cold water machines and is designed to replace or upgrade your existing spray gun for your pressure washer. This spray gun is equipped with a trigger safety lock-out and can be used with pressure washers with standard threaded high pressure hose and wand connections. The spray gun has an ergonomic design and easy pull trigger helps reduce hand fatigue for all day use. Designed to fit most gas pressure washers and is rated up to 3400 PSI.