Made from a closed cell sponge rubber, the 1.5" RubberFab Buna Gasket is used to provide a complete and secure seal between fittings on your vacuum system. The flanged design assists in easy assembly with other corresponding fittings. Buna is made from food grade, 3A approved materials that offer good compression at a limited temperature range. The buna elastomer can stand up to constant contact to water and steam. The sanitary gasket is commonly used in the assembly of frontline vacuum plumbing and process systems.