... 3000mm 3,Material:rubber,steel Rubber Check Valvea: Rubber Check Valve Product Introduction 1:Rubber check valve is made of rubber ,it looks ... water flows in from the inlet,and the lower water pressure will open the valve,the higher the water ... service life5 Wide size,norminal size:DN50~DN3000mmc:Rubber Check Valve Application Scope1 product performance, complete specifications,wide application2 ...