Name:tubing couplings Std Ref:API 5CT Grade:J55,K55,N80,L80,C90,P110, N80-1,N80-Q Type: ... Coupling Manufacturer of Tubing and Casing coupling according to API SPEC 5CT AND 5BAPI couplings for oil tubing and casingSize and ... .584.894-1/2"EUE141.30*158.756.051.Grade:J55, K55, N80-1, N80-Q, L80, C90, P110 2. ... anchors of oil pumps and revolving sand gravitated device, etc API 5CT oil tubing couplings