... . WQA standard products are available. RUBBER SEAT/ RUBBER GASKET(For butterfly valve)WHY CHOOSE US?1. The rubber materials are NSF61 compliant ... , SGS, UL, NSF, WRAS, etc.Our rubber products include: bearing seal, valve rubber products, o ring kit, o ring, x ring, v ... ring, oil seal, wiper seal, u ring, rod seal, piston seal, rubber cord, etc. The molded rubber products include ...