... (gas or liquid) in one direction and allow flow in the other direction.1.Five port sizes. ... inside diameter of the tube in which it fits) 1/8", 3/16", 1/4", 5/16" and 3 ... diaphragm materials. fluorosilicone, Viton, silicone and EPDMFunction:1.Prevents damage to equipment, pumps, and flow ... morefirmlyPacking:plastic bag and wrapped, cased in small carton 1/4"PVDF VITON Ozone Resistance barbed plastic check ...