... 4"NB IN Class : 3000 LBS, 6000 LBS, 9000 LBS Type : Socket Weld (S/W) & SCREWED (SCRD) aa NPT, BSP, BSPTConcentric Reducer ... ; ST33, ST37 .ST35.8 ST42Alloy steel: ASTM A420/420MConnectionButt Welding/Socket Welding/ThreadShapeEqual / Reducing(elbow, tee,) Ecc/Con (reducer)Angel30Degree,45Deg ...