Standard quick connector set makes a quick connection for hose, pump, ball valve, telescoping wand, surface cleaner and gun 3/8" quick connect plug + 3/8" male NPT thread; 3/8" quick connect socket + 3/8" male NPT thread Made of stainless steel, the power washer adapters are rustproof, corrosion-resistant, stable and durable to use The ball lock design ensures a solid and leak-free connection Working pressure is up to 5000 PSI, the couplers fit most pressure washers.