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It is a floor mounted tub filler by screws. So the supply line will be partially accessible. Good point on future need of changing supply line. I will use the one with stop.

I am trying to add a connection adapter from cold/hot water supply line to tub filler. The tub filler is AKDY TF0021 (https://www.homedepot.com/p/AKDY-1-Handle-Freestanding-Floor-Mount-Roman-Tub-Faucet-Bathtub-Filler-with-Hand-Shower-in-Chrome-TF0021/300943794). Attached is picture of the water...

Sure. NIBCO does make PVC 2" x 1-1/2" x 2" x 2" Hub Double Fixture Tee DWV (https://www.menards.com/main/plumbing/pipe-fittings/pvc-pipe-fittings/nibco-reg-hub-pvc-double-fixture-tee-dwv/k277500/p-1444449207844.htm), which appears less common than 2" x 1-1/2" x 1-1/2" x 1-1/2" Hub Double Fixture...

You are right the 1-1/4'' copper 90 degree long radius is available. However, I failed to find any 1-1/4'' PVC long sweep elbow. I guess as Wayne said, the fact that 1-1/4'' PVC elbow is not available probably suggests the 90 degree long sweep is not required or not a need. Anyway, if anyone...

Thanks for the suggestions! Then I will use the Fernco Flexible coupling. I did more calculations that the void space between two studs is 13-3/4'', which is enough to accommodate two Fernco coupling (2*2.13''), one double fixture tee (7.13''), and some short PVC connections. I think I could...

Good finding for 1-1/4'' copper coupling! For the 1-1/4'' plan, I also could not find any 1-1/4'' long sweep elbow for either PVC or copper. Two 45 degree elbows instead might be required. Here is another option that is possible for the 1-1/2'' waste line. It does require a stud hole size of at...

For the minimum cooper (no soldering) option, there will be waste line size changes from 1-1/4'' PVC to 1-1/2'' PVC, and to 1-1/4'' Cu, finally to 1-1/2'' PVC on the double fixture tee. Will there be any problem of size changes of getting bigger and then smaller?

Is threaded fitting legitimate for waste line? Do you need apply teflon tape when connecting?

1-1/4'' copper actually will give more room to wiggling over the stud hole size. Fortunately Fernco also supplies 1-1/2'' PVC to 1-1/4'' copper coupling rubber connector (https://www.fernco.com/dimensional-drawings/3001-1125). Worst scenario is that 1-1/4'' copper can be for the venting line...

Is this the Charlotte flush bushing you are referring to? I was able to find one on ebay (https://www.ebay.com/itm/Charlotte-Pipe-Schedule-40-Spigot-To-Hub-1-1-2in-x-1-1-4in-PVC-Flush-Bushing-/233350421460) and this size is also listed on Charlottee's product catalog.

Yeah, it is very tight. At least theoretically it will work.

Wayne, thanks for sharing the fernco coupling. This will work. The current stud layout is quite complex and the space is also very right. My plan is to at least use the existing vent line. After reading everyone's suggestions, currently I have two plans below. I personally prefer the first plan...

My stud width is not the standard 3-1/2'' instead it is only 2-3/4''. I did some calculation that for a non-bearing wall the max hole that can be drilled through is 60%, which will be 1.65''. For this size, the 1-1/2'' PVC won't be able to penetrate through without disrupting the integrity...

Good thinking! I guess I can also use a bushing reducer. Lowe's has this 1-1/2-in x 1-1/4-in dia x 2-in L Bushing Bushing PVC Fitting (https://www.lowes.com/pd/LASCO-1-1-2-in-x-1-1-2-in-x-1-1-4-in-dia-x-2-in-L-Bushing-Bushing-PVC-Fitting/3371596).

Terry, thanks for the quick reply. I also found that double wye tee will not be good for lavs due to venting issues. I searched everywhere possible on the web and could not find any double fixture tee with 1-1/4'' side for DPV either. Just want to confirm this with everyone on the forum since...

Is there such double fixture tee with 1-1/4 inch on the side? I want to use a double fixture tee to convert single vanity to double vanity. But the stud width is narrow and only allow 1-1/4inch PVC pipe to penetrate through without disrupting the stud integrity. Obviously the 1-1/4inch will then...

I am trying to connect 2'' PVC pipe to an existing cast iron (CI) hub. The inner diameter of the CI hub is about 3-1/4''. The same question was asked previously by someone else (https://terrylove.com/forums/index.php?threads/donut-sizing-for-cast-iron-pipe.68307/) but no final solution was...

Have you find a solution for this? I have the same issue.

Good point on the DFU! Now enlarging the drain pipe size to 2'' totally makes sense to accommodate the addition of new shower. Actually if the drain size is increased to 2'', it seems to me that the plumbing layout could be even much easier including not need of the previous vent for tub. Or...

The existing lav drain and vent is 1-1/2''. I also added another proposal on the main post using sanitary tee with side inlet. I am thinking if the side inlet is positioned upwards and used for dry vent, that will solve the problem of possible horizontal dry vent.