Drainage, Waste & VentQuestion 12 of 120
Which fitting is acceptable for changing direction from horizontal to vertical in a drainage line?
a.A sanitary tee
b.A double sanitary tee serving back-to-back water closets on a 3 in stack
c.A short quarter bend on the horizontal branch alone
d.A sanitary tee installed on its back so flow enters horizontally
Explanation
A sanitary tee is designed for horizontal-to-vertical direction change and is the standard approved fitting for that transition. A double sanitary tee is restricted where back-to-back water closets would discharge into each other on an undersized stack, a short quarter bend is not permitted for horizontal-to-horizontal or horizontal-to-vertical drainage flow, and a sanitary tee laid on its back obstructs flow and is prohibited.
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