... , 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 ... -metal are competitive.The formulation of partial products is independent research and development by us. RUBBER VALVE SEAT/ RUBBER GASKET (for butterfly valve) ...