Flange Size Working Pressure Lift Threads ConnectionBore 2-1/16 5000psi 2-3/8 EUE 2-1/16 2-9/16 5000psi 2-7/8 EUE 2-9/16 3-1/8 5000psi 3-1/2 EUE 3-1/8 2-1/16 10000psi 2-3/8 EUE 2-1/16 2-9/16 10000psi 2-7/8 EUE 2-9/16 3-1/16 10000psi 3-1/2 EUE 3-1/16we have got API approved with our license number 6A......