Profile: Grumen Mfg., Inc. an ISO 9001-2000 company is a source for gaskets and seals. Our diverse product range consists of non-metallic gaskets, washers & seals, bumpers, stoppers, spacers, bushings and grommets. Our capabilities include lathe, die, guillotine, rotary knife cutting, molded rubber, slitting, bonding, splicing, assembly and packaging.