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The SIMPSON hot water spray gun is designed to replace or upgrade your existing spray gun for your pressure washer. The 80178 is rated up to 5000 PSI and comes equipped with threaded M22 fitting and quick connect adapters. Its ergonomic design and easy pull trigger helps reduce hand fatigue for all day use. The 80178 is designed to fit most gas pressure washers and rated up to 5000 PSI.