EPDM GASKETS FOR SULFUR DIOXIDE EPDM: ETHYLENE PROPYLENE DIENE MONOMER Shelf-Life: 5 years, manufacturer’s recommendation. SAX REPLACEMENT GASKET SET CONTAINS: (1993 - 2013 STYLE)(2)  1EPR GASKET MOLDED EPDM (5 7/8"OD x 5" ID x 3/16") 2 72.75(2)  8-9EP GASKET EPDM MATERIAL 2-1/2" sq. x 1/8" thick 2  25.25  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