simpson cleaning morflex 3700 psi 50 foot home pressure washer hose (2 pack) simpson cleaning whether you need a replacement or a flexible extension to your existing hose, the simpson morflex 3700 psi cold water pressure washer hose will bring any pressure washing job within reach. this hose is durable yet flexible reinforced with heavy duty braided polyester and a flexible design that resists that annoying kinking you see in other hoses. the fittings on each end make it fit with most gas pressure washers with standard m22 threaded connections. it also features 4 inch bend protectors on each end. ideal for "cold" water applications up to 140 degrees f, this 50 foot long and 0.31 inch thick hose can handle a maximum pressure of 3,700 psi.