Steam Pipe Tees - Mild Steel Steam Pipe Tees - Mild Steel 25NB, 32NB, 40NB, 50NB, 65NB & 80NB high quality ASTM A234 steampipe Tee pieces in Schedule 40S (SCH 40) mild steel. Commonly used to fabricate a turbo log manifold. Size A B C Wall 25NB 33.4 26.6 38.1 3.4 32NB 42... MSRP: Was: Now: $13.34 - $62.92 Choose Options