I have a question with a SCH40 PVC fitting, specifically the Charlotte part #416 fitting which is a sanitary tee with a side inlet fitting as shown below.



I am interested in possibly using the 3X3X3X2 version. My question is, what is the "side inlet" for? Is it a 2" sanitary tee connection? If this is to be used in a stack vent scenerio, can I use the 3" for a toilet and the 2" for a shower?

If the side inlet is not a sanitary tee connection, is there a fitting with two sanitary tees but with orthogonal connections? I have the toilet and shower on the same side of the drain/vent so I cannot use a double fixture fitting, and I do not have the vertical distance to fit in two sanitary tees even if I use street fittings for both.

sum, this is the exact intention of this fitting. If you look at the drawing, the side inlet enters the stack higher than the toilet inlet does. so the side inlet is stack vented above the toilet.
there are of course limitations to the length of the trap arm for the tub or shower.

Packy thanks!

It's just seems strange that the 2" inlet, looking at the picture, does not look like a sanitary tee connection because it doesn't have a curve on the underside, almost look like a vent connection.

if you look CLOSELY at the drawing you will see that it DOES have a curve/bevel

Yes that's correct but it's misleading...that should be a dotted line to show the curve on the inside of the fixture.