Sanitary tees are used to connect horizontal lines to vertical lines. But wyes are used to connect vertical lines to horizontal lines. You can also use wyes to combine or split horizontal lines. Wyes can be used as a replacement for vent tees as well.

Can you use a wye for drain?

Wye is used to connect a horizontal drainpipe to a vertical one. It reduces the entrained solid at the junction. It is also used to split branch lines. With a Wye, a line can be divided into two equal lines in two different directions.

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. Though, check with your local Codes, Building, Zoning, Permit or Inspection Department (whatever they’re called around you).

When can I use a sanitary tee?

A sanitary tee should be used when connecting a horizontal run, such as a waste arm to a vent stack or vertical riser.

What’s the difference between a sanitary tee and a regular 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.

What is the difference between a wye and a tee Wye?

Sanitary tees are used to connect horizontal lines to vertical lines. But wyes are used to connect vertical lines to horizontal lines. You can also use wyes to combine or split horizontal lines.

Can a wye be used horizontally?





Bookmark this question. Show activity on this post. IPC TABLE 706.3 “fittings for change of direction” says wye is okay for horizontal to horizontal.

Can a wye be installed vertically?

Connecting a trap to a vertical drain with a wye fitting and a 45-degree elbow seems like a good idea. But it’s not. As water drains down the steep slope at the wye, it can create a siphon effect such that water will be sucked out of the trap.

What is a double wye used for?

Double Wye HxHxHxH

Installed in a vertical PVC DWV piping system to allow for a smooth transition from two horizontal branch lines into the vertical drainage line. Often used with a threaded fitting cleanout adapter and plug, to allow access to the piping system.