... 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 ... are for an inert high purity smooth and clear flow path.3.Use with liquids and gases for pressure or vacuum applications.4 ...