... FDA, NSF, UL, etc.7. Style: O ring, X ring, D ring, V ring, etc.8. Applications: automobile, electrical appliance, mechanical ... strict quality control and assurance system.3. Compression machine: 11 sets, from 50 tons to 200tons ... be water proof. -------------------------------------------EPDM rubber watch o ring----------------------------------------------Our products: EPDM rubber watch o ringWelcome ...