Double Quality Twist Seal CouplersCouples U.S. Standard Pipe Threads to 22mm European Fittings Found on imported pressure washers.Internal O-ring with back ring seal assures no-leak operationOversized high-impact plastic knobMachined brass body7.8 GPM max flow4000 PSI max pressure302 deg. F3.9 to 4.2 oz weightPA