Constructed of food-grade Wil-Flex™ Santoprene™, Wilden 3 in. Full-Stroke Integral Piston Diaphragm is suited for use in Wilden’s Saniflo™ FDA pumps, as well as Original™, Advanced™, and Advanced™ FIT series of air-operated double-diaphragm pumps. Integral piston is completely encapsulated within TPE material, so there is no outer piston that can trap fluid and particles. Operating from -40 to +225°F, diaphragm meets requirements of FDA CRF 21.177, EHEDG, and 3A.