Union Cross – Tube Butt Weld Union Cross – TubePart NoT Tube O.D. (in.)T Wall Thickness (in.)LBFWork. Press, (psi)PUC-4TBW-SS1/40.06516.39.79.510320PUC-4TBW-SS3/80.095189.711.19930PUC-4TBW-SS1/20.09524.414.214.36780PUC-4TBW-SS 3/40.12033.319.120.65530PUC-4TBW-SS10.13437.119.127.04480