Hi,
I need some advice. I am trying to install a shower in my bathroom. I need to connect the shower drain (yellow line) to the vent and down to the main drain (blue line). What is the best way of connecting to the PVC drain at the red circle? I am worried that I might not be able to move it around enough to glue PVC the usual way. Do I have any other options? Thanks for the help!

 

Not a plumber so I would wait for for a pro to drop by and confirm my suggestions.

You could cut out a section further to the left closer to the the 4x4x2" wye and then install your new wye/tee where you need it. Then make your connection to the 4" either using a 4" repair coupling, which doesn't have the stop in the middle of the fitting, or just use a rubber coupling. The rubber coupling will be easier as you will need to work VERY fast to get the repair coupling on before the glue sets.

 

Agree with Tolyn's suggestion to use rubber coupling, except you need to use this type:

4 in. EPDM Rubber Shielded Coupling-P3000-44 - The Home Depot

which is intended for permanent use and can be buried.

 

That is a better one Carbide. I was looking for one but couldn't recall what is was called. I have edited my previous post.

 

Thank you all for your helpful replies. I had seen the rubber coupling at Home Depot but I did not think I could bury it. But this sounds much easier than trying to glue the PVC so I am going to try it.

 

I'm a bit confused by the blue/yellow lines, but you can probably just wye off the main line to your shower p-trap. The vent is already taken care of by the bathroom sink a foot or two away. It's a wet-vent, but allowed since it's the same bathroom group.

Or am I misunderstanding your plan?

 

Thanks for your reply. I thought the shower needed to have its own vent. Are you saying my yellow line can connect directly to the main line? That would be so much easier. Also, in that case, would it be ok to connect the shower drain to the main line "upstream" of where the vent connects? Since I would be moving the toilet a bit, doing a cemented joint there wouldn't be a problem.

 

From the way I see it, yes, you can wye out of the main line, continue horizontal (with a 1/4" drop) to the p-trap, then continue up to the shower pan.

But just to clarify, the shower drain needs to be horizontal into the main drain, you can't set it higher than the main drain and drop down vertically. And as long as the sink is vented properly, that will function as the shower vent - as long as it's within 5' of the shower trap, which in your drawing looks like won't be a problem.

 

Thank you, that's very helpful. This means that the p-trap will have to be at the same level as the main line. So drop straight down from the shower to the p-trap and horizontal wye connection to the main line using a shielded rubber coupling.

But this would not allow me to connect to the main line upstream of where the vent connects. This is because the main line itself and the other drain line feeding into it would be in the way. The reason I would want to do this is that I am moving the toilet (that is where the black plastic is in the picture) a few inches (to the left in the picture) which would make it very easy to do a cemented joint on that part of the drain. Can I still use the original plan with the added blue vent for the shower, drop down to the level of the main line at the vent, go upstream parallel to the main line with the 1/4'' drop, and connect to the main line upstream of where the existing vent connects?

Or is avoiding the rubber joint not worth the trouble? It just seems to me an actual pvc cement joint would be preferable.

Thanks so much for the help.

 

Somebody please help! Following the suggestions that I got, I am preparing to splice a wye into an existing drain line. I will be using a rubber coupling on one side of the wye. Before I cut into the drain line, I made a mock up of the situation (with actual dimensions) to make sure it would work. I am having difficulty getting the wye in place given that there is no play in the existing drain (picture). Is there any 'trick' to slide this into place?

My other option would have been to use two rubber couplings (one on both sides of the wye). Unfortunately, there are two other couplings on both sides of where I want to put my wye (15'' apart) not allowing me to create enough space between the rubber couplings to slide in the wye.

Any help is much appreciated!

 

That is generally how it goes unless you can move one of the lines to the side and slide the fitting in