Product Name: oil tubing pup joint (pipe fitting pup joint, pipe fitting). Standard Reference: API spec 5CT Size: From 2-3/8" to 4-1/2" Grade: J55, K55, N80-1, N80-Q, L80, C90, P110 Thread Type: STC, LC, BTC. Dimensions and their tolerances of tubing round-thread as per API spec 5B Surface treatment: Coating Protection of Thread: Thread protector. By wooden case, wooden pallet, or by the requirements of customers.