Draining a lavatory into a double fixture fitting

[James A Pettit]

Can I use the vent off a double fixture with 1/8 th bend as a drain for a lavatory

 

[Terry]

A wet venting section needs to be 2"

 

[Sponsor]

 

[hj]

Yes, No, or Maybe. It all depends on WHAT you are doing and HOW you do it.

 

[James A Pettit]

Yes, No, or Maybe. It all depends on WHAT you are doing and HOW you do it.

I'm using a 3" double fixture fitting with a 1/8th bend with a closet fixture on BOTH sides for back to BACK toilet drains and off the top of the fitting its has a 3x2 bushing can I put in a sanitary tee and arm over to a 2" double fixture fitting then come off the top of it and revent BACK in the 2" toilet vent

 

[James A Pettit]

A wet venting section needs to be 2"

I used a 3x2 bushing off the top of the double so I can put in a sanitary tee and arm over to a 2" double fixture fitting then come off the top of it and revent BACK into the 2" vent for the toilets?

 

[James A Pettit]

A wet venting section needs to be 2"

So I can come off the top of the double fixture fitting with a 3x2 bushing then put a 2" sanitary tee arm over turn up with a 2" long sweep into a 2" double fixture fitting then come off the top of it and revent into the 2" vent for the toilets?