EPDM GASKETS FOR SULFUR DIOXIDE EPDM: ETHYLENE PROPYLENE DIENE MONOMER Shelf-Life: 5 years, manufacturer’s recommendation. SA REPLACEMENT GASKET SET CONTAINS: (STYLE CURRENT AS OF JAN. 1 2013)(2)  1EPR GASKET MOLDED EPDM (5 7/8"OD x 5" ID x 3/16")(2)  8GEP GASKET EPDM  BUTTON 1-1/2” dia. X 3/4” lg.  Note: Gaskets can be used for Ammonia as well. NOTE: PRE-1993 SA GASKETS (1EP16/1EP33) NO LONGER SUPPORTED, CUSTOMER MUST UPGRADE. 5 YEAR RECOMMENDED SHELF-LIFE