... 3/8"to 4 1/2" 2.Material: J55,K55,N80,L80,C90,N80-1,N80-Q 3 ... manufacturer of Tubing and Casing coupling according to API 5CT AND 5B API couplings for oil tubing and casingSize and SpecificationsDescriptiongs and size Type ... -1/2"EUE141.30*158.756.051.Meterial:J55,K55,N80-1,N80-Q,L80,C90,P1102. ... 13-3/8"4.Type:NU,EU(tubing coupling),STC,LC,BTC(casing coupling)5.Surface treatment: whole phosphating, ...