U RING(U RING/ PISTON & ROD SEAL) 1. ISO9001, RoHS, REACH, UL 2. Material ... VITON/SI/EPDM 3. TYPE: NOK/ VALQUA STANDA U RING(U RING/ PISTON & ROD SEAL) WHY CHOOSE US?1. NOK and VALQUAstandard ... 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 ... is independent research and development by us. U RING(U RING/ PISTON & ROD SEAL)