... of the tube in which it fits) 1/8", 3/16", 1/4", 5/16" and 3/8".2.Three housing materials. nylon type 66, polypropylene ... and PVDF3.Four diaphragm materials. fluorosilicone, Viton, silicone and EPDMFunction:1 ... more firmly.Packingplastic bag and wrapped, cased in small carton 1/8" miniature valves ozone check valves one way valves