Porter Seal Company - Supplying O-Rings & Gaskets to Industrial & Military Industries For Over 25 Years custom rubber, custom plastic, rubber bushings, rubber diaphragms, rubber cups, rubber seals, rubber bumpers, rubber grommets, rubber gaskets, rubber o-rings, rubber hydraulic brake parts, rubber recycling discs, rubber recycling stars, rubber car boots, rubber auto boots, rubber couplers, rubber valves, rubber duckbill valves, rubber rc tires, dallas, texas, irving, tx Porter Seal Company manufactures and distributes custom rubber products including o-rings, grommets, bushings, gaskets and other custom rubber & plastic replacement parts.