... hatch cover 3.According to your drawing Rubber o-ringProduct description1) Main products: O-rings ... Custom design rubber parts3) Materials include: silicone rubber, nitrile rubber, EPDM, neoprene rubber, viton DuPont & Dow elastomers, natural rubber, SBR, ... in rubber and plastic products since 1993. Covering rubber sheet , rubber extrusion, rubber seal strip,gasket,rubber nolding products ...