Can I bury a Test Tee under a slab?

[David Christensen]

Plumbing for new addition is tying into existing 3” under slab. Need to install test tee between old and new. Can I backfill over Test Tee once done? Also can Test Tee lay on it’s side or on it’s back?

 

[Bestdogever]

I have the same question, I need to isolate new plumbing from old and can only accomplish that if I am allowed to bury the test tees. Installed on their back.