Can a Wye Lay on Its Side

Horizontal Drains Can Combine Through Wye Laying Flat, Or Can’t They? IPC TABLE 706.3 “fittings for change of direction” says wye is okay for horizontal to horizontal.

Can you use a wye for venting?

Absolutely! Most any fitting is perfectly acceptable and legal, just don’t use any reducers, caps or traps in the venting.

What is the difference between a sanitary tee and a vent tee?

A sanitary tee is a plumbing fixture that allows liquids to drain while also allowing the plumbing system to vent. The fitting resembles a normal tee fitting; the sanitary tee, however, when viewed from the side will have a definite downward sweep to the center inlet.