... API 5CT Near Tianjin Port,fast delivery China famous brand 1.API 5CT seamless tubing coupling and casing coupling2.ISO 9001 ... 158.756.05 J55,K55,N80Q,N801,L80,P110Casing Coupling4-1/2"STC127.00*158.755.23J55,K55,N80Q,N801, ... L80,P1104-1/2"LTC127.00*177.804.15 J55,K55,N80Q, ... J55,K55,N80Q,N801,L80,P1107"STC194.46*184.158.39 J55,K55,N80Q,N801,L80,P1107"LTC194.46*228.6010 ...