Is it permitted to drain a toilet 'directly' into a sanitary tee (closet flange into sanitary tee)? Toilet is in the center of an in-line plumbed bathroom with sink on one side, shower on the other.

Is it permitted to drain a toilet 'directly' into a sanitary tee (closet flange into sanitary tee)? Toilet is in the center of an in-line plumbed bathroom with sink on one side, shower on the other.

Yes as long as it's vented. Please explain your layout. Two vents? A separate vent for the shower and the lavatory or is the shower wet vented by tieing it into the lavatory drain? Regards, Tom

Had planned on a single large vent for the toilet, try to tie in the shower and sink horizontally to the large vent. Layout is shower on highest grade, sloping down to toilrt, then to sink where drain exits the building. Hope is to plumb directly under fixtures into sanitary tees (in spite of traps) with cleanout at shower location.

Had planned on a single large vent for the toilet, try to tie in the shower and sink horizontally to the large vent. Layout is shower on highest grade, sloping down to toilrt, then to sink where drain exits the building. Hope is to plumb directly under fixtures into sanitary tees (in spite of traps) with cleanout at shower location.

Try this on for size. One 2" lavatory vent to the roof while the lavatory drain ties into the main the toilet drain into. If the shower were on the same side as the lavatory you could tie to the lavatory drain and wet-vent the shower. However, since it's on the other side of the main you can't tie to the lav drain so a separate vent must be run for the shower and revented back to the lavatory vent. Sound like a plan? Cheers, Tom

Thanks, Tom!