[noderman]

Please see attached picture. My question is about the fitting where the trap arm connects with the vent line. I would like to use a sanitary tee in order to be able to maintain the proper pitch for water to run. I am unable to maintain pitch if use the sanitary tee vertically. I have read that a sanitary tee cannot be used horizontally, but in this case it seems to me to be more vent than drain. Any thoughts would be helpful.

Thank you

[iamgrowler]

What you want use for what you have drawn is a 2" combo.

It's basically a 2" Wye with a 2" 45 added to make the Wye portion truly vertical.

[doug238]

The trick here is this. A vent must rise on a minimum of a 45 degree rise for a dry vent and can not be greater than a 45 degree rise until you get at least 6 inches above the flood level rim of the fixture it serves. A tee or 1/4 bend can not lay on its side or back.
However, on a setting like inside a ceiling you can run a dry vent horizontally. The inspector will cringe but allow it. On your layout I suggest a 2" wye or combination horizontally to use a sweep to rise. It allows you the depth and stay legal.