... NBR/VITON/SI/EPDM 3. TYPE: NOK/ VALQUA STANDA U RING(U RING/ PISTON & ROD SEAL) WHY CHOOSE US?1. ... hydrocarbons and animal and vegetable oil.ABOUT USDalian Yingyu Co.,Ltd. is a leading designer and manufacturer of seals and ... ring, x ring, v ring, oil seal, wiper seal, u ring, rod seal, piston seal, rubber cord, etc. The ... is independent research and development by us. U RING(U RING/ PISTON & ROD SEAL)