Std Ref.:API 5CT 5B ISO9001,2008 Grade:J55,K55,N80-1, ... Tubing Pup JointS (pipe fitting pup joint, pipe fitting)Standard Reference: API spec 5CTSize: From 2 3/8" to 4-1/2 ... . Dimensions and their tolerances of tubing round-thread as per API spec 5BSurface treatment: CoatingProtection of Thread: Thread protectorPacking: By ... , we provide the high quality and competitive price products. API Pup Joint