qcbernard
Mechanical
- Dec 3, 2006
- 1
i dont have an updated code book b31.1 what does the code book require?
Smaw or Gtaw ER-70s2 on 3/4 inch elbows/90's
Smaw or Gtaw ER-70s2 on 3/4 inch elbows/90's
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