... Umbrella valve 2.Material:NBR 3.Certification:FDA Grade 16.8MM Umbrella Valve Item16.8mm Umbrella ValveBrandRAMISCountry of OriginXiamen, ... ChinaItem No.RS70104Umbrella O.D16.85MMPreloading distance Opening pressure0.3-55kPaMaterial NBRColor BlackPerformanceWear resistant and ... to ASTM, DIN, SAE,VDA6.1, UL, FDA, JIS . 16.8mm Umbrella valve