... of the tube in which it fits) 1/8", 3/16", 1/4", 5/16" and 3/8".2. ... Four diaphragm materials. fluorosilicone, Viton, silicone and EPDMFunction:1.Prevents damage to equipment, pumps, and flow systems ... with a wide variety of cracking pressures Advantage:1.We offer competitive pricing and reliability because we ... and wrapped, cased in small carton 1/4"PVDF VITON Ozone Resistance barbed plastic check valve