... valves 1. 100% factory tested 2. best price 3. shipping fast 4. free samples custom-built check ... 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 ... and wrapped, cased in small carton 3/8" custom-built check valves check valves valves