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✔ Quality - High quality PVC check valves with 21 mm hose sleeves for air and water applications ✔ COMPLETE SET--Valves come with 4 matching hose clamps (16-27mm clamping range) ready to assemble ✔ PERFECT FIT - The check valves are perfectly suited for standard drain hoses in washing and dishwasher machines ✔ Complete solution – no more dirty water in the washing machine ✔ EASY TO CLEAN - 21 mm check valves can be easily screwed on and the diaphragm cleaned