Perko Flush Pro Valve - 1". Freshwater flushing of your inboard is as simple as connecting a garden hose Valve only. Fits Hose Size: 1-1/4". Durable check valve system activated by water pressure from a garden hose. Can be used with onboard generators. Specifications for Perko Flush Pro Valve: Manufacturer: Perko Color: Black Features of Perko Flush Pro Valve Clear polymer Check valve automatically shuts off hull intake when water pressure is applied Can be used with onboard generators Adapter supplied with flush pro makes winterizing your boat easy Durable check valve system activated by water pressure from a garden hose Package Contents: Perko Flush Pro Valve Perko 0456DP6: Flush Pro Valve - 1"