Made of high quality copper and stainless steel materials, practical and durable. We offer 4 kinds of coupler for option (G1/4 double nipple, G1/4 male, M14 male, G1/4-M14 double nipple), you can choose one or more according to your needs. High replacement couplers provide safe and quick couplings, easy to connect and disconnect. Maximum pressure is up to 5000 PSI. Two quick connectors connect the water outlet of the pump to the pressure washer hose or connect the pressure washer hose to the gun. The other two quick connect kits convert 3/4' threads to quick release fittings, connecting all standard 3/4' garden hoses to the electric washer pump water inlet. /p> WARNING: The M22 14mm swivel fitting has an inside diameter of 14mm, NOT 15mm.