... 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 ... with a wide variety of cracking pressuresAdvantage:1.We offer competitive pricing and reliability ... wrapped, cased in small carton 1/8" miniature valves ozone check valves one way ...