MARS has been manufacturing Various Tubing and Casing Couplings & Pup Joints as per API with different material grades and specifications API 5CT Product PUP Joints ( 1.66" to 4-1/2 ") EUE , NUE Max 15 ft Tubing Couplings ( 1.66" to 4-1/2") EUE & NUE Casing Couplings ( 4-1/2"to 13-3/8") STC, LTC, BTC Material