pipe tubing and couplings: 1)O.D.2-3/8", 2-7/8", ... " 2)length:R1,R2,R3 3)Grade: J55, N80, L80, C90, T95, P110 pipe tubing and couplings 1)Size: O.D. ", 2-3 ... /8", 2-7/8", 3-1/2", 4-1/2" 2) Grade: J55 ... ,R2,R3 5) Thread: 8RD and 10RD 6) All our Tubing accord with API SPEC 5CT standard, and we get the right to ...