... , BUNA, MVQ, ACM, FLS, CR, SBR, SI, BR, IR, IIR, PU,E/A, ECO, CSM, FKM, FPM, etc.2. Characteristics: good ... tolerance: exactly upon your request or standard tolerance.5. Color: black, transparent, green, red, yellow, grey, purple, pink, etc. or upon ... time: 1~3 weeks.8. Small order quantity is welcomed. black viton o ring for valve