Which part of a drain system is the "sand tee"?

[Stephen Tashiro]

Which part of a typical household drain system is called the "sand tee"?

[Patrick McCarthy]

Google sanitary T or tee

[glenn bradley]

+1 - I think you are talking about a "san-T" (sanitary tee).

[Stephen Tashiro]

Google sanitary T or tee

Yes, that must be it. It's interesting that misusing such a fitting is a common plumbing mistake. http://www.ncwhomeinspections.com/Sanitary+Tees,+Wyes+and+Sanitary+Combos