Questions about a basement shower/tub drain rough in

[Jimjr]

Hi,

We have a 2 inch cast iron drain pipe rough-in in our concrete basement floor. Picture included. It was installed by the builder's plumber when the house was built.

This drain was used for many years with a shower installed over it. No issues. We're upgrading to a tub/shower combo.

(1) My first question is that the drain can be moved a little bit. Are they made that way or is something broken? I can imagine they are made that way so that you have some wiggle room?
(2) Is there a p-trap for this drain under the floor?

I think the answer to #2 is "yes" and here's why. We would never have any septic smell from this shower unless it went unused for a long time. I would just run the shower water for a minute and the smell would go away. Also, now I have poured water into this drain and it doesn't drain completely away - you can see some standing water down in the drain. And yes it needs some clean up! There is a rubber donut installed for 2
inch PVC to be inserted.

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[Dj2]

1. You can move this drain to meet the new tub drain location, but you will need to break up and remove more concrete.
2. Once you remove the gravel and rocks around the drain hat you have, you will see the Ptrap.
3. The reason why you smell sewer if the tub is not used for extended periods of time is because the water in the Ptrap dries up.

 

[Sponsor]

 

[Jimjr]

1. You can move this drain to meet the new tub drain location, but you will need to break up and remove more concrete.
2. Once you remove the gravel and rocks around the drain hat you have, you will see the Ptrap.
3. The reason why you smell sewer if the tub is not used for extended periods of time is because the water in the Ptrap dries up.

Thank you.

I've attached 3 more pictures and my ultimate question is: What is the correct way to connect the 2 inch cast iron pipe together? Please see pictures and info below.

So, I'm going to break up more concrete and cut off a section of the old CI drain with p-trap included.

This is an overview picture. Next picture has markup to show new tub drain location.

The picture below shows where the new tub overflow pipe will be located. I need to cut out a section of the PT 2x4 and remove a little more concrete to have room to work.

Although it's pretty obvious where I need to "tap into" or "connect to" I've included a marked up picture of that too. This is where I need to attach the old section of cut off drain and p-trap.

I believe I know the correct way to insert/connect the new tub overflow pipe (1 1/2 inch brass pipe) into the "old" shower drain pipe that has the rubber donut.