Simpson MorFlex 3700 PSI 5/16 in. x 50 ft. Cold Water Replacement/Extension Hose - 41109. 5/16 in x 50 ft. x 3700 PSI. Polyester braided inner jacket for long life. Polyurethane outer jacket with 4 in. bend protectors. M22 threaded connection with adaptor included. For cold water use only. Designed to fit most brands of gas and electric pressure washers