... 3000mm 3,Material:rubber,steel Rubber Check Valve a: Rubber Check Valve Product Introduction 1:Rubber check valve is made of rubber ... service life5 Wide size,norminal size:DN50~DN3000mm c:Rubber Check Valve Application Scope 1 product performance, complete specifications,wide ... for drainages from sewage reservoirs8 smell separation d:Rubber Check Valve Package and delivery 1 General package is wooden ...