Inserting T-fittings in existing vertical dwv

[Anonymous]

Posted by: Zimsky (old forum transfer)
Posted - 03/05/2002 : 13:22:26

Handy Ron,

I have a question regarding a recent project involving adding waste pipe for to supply a wet bar in a finished basement.

As part of this project I had to tap into an existing 2" vertical abs dwv. I achieved this by simply removing a portion (~ 5 in) of the existing vertical 2" abs dwv and installing a 2" abs dwv sanitary tee to branch off of and supply the new sink in the basement. Although I managed to fit the new 2" sanitary tee between the cut ends of the existing 2" drain, I had to "cheat" the length of the joint about 1/4 in order to fit the tee between the two lengths of 2" pipe. Although I ended up with a fairlt snug water tight joint, the ends of of the vertical drain do not "bottom out" inside the fitting. In fact, there is about 3/16" north and south.

Is there a "trick" to inserting a tee and/or wye fitting between an existing vertical waste pipe to achieve a joint that "bottoms out" on both sides of the fitting?

Dave

[Anonymous]

Posted by: Wgoodrich
Posted - 03/05/2002 : 14:12:09

It depends a lot on the conditions where you are tapping in. IF you are in a middle of a pipe that is where you can sway the pipe enough to get the tee in place then you can pull the pipe straight and into the tee butted where it belongs.

If you do not have the room to create the bend as discribed then they have what I call a rubber boot that you can install short pieces of pipe into the tee just like you were glueing two pipes into the tee only about 6" long beyond the tee. you cut the exact length of pipe out of the existing drain pipe so the tee and the two pieces of pipe glued into the tee can fit butted to the existing pipe replacing the peice of pipe that you cut out of the existing drain. This can be done whether it is a dry vent made into a wet vent or even a normal drain pipe. This type of installation is very common when cutting out a piece of metal drain that has plugged up and can not be repaired. You just cut out the plugged section of metal drain and insert a plactic section of drain pipe into the same space matching the old part of pipe that you cutout. Then you slide this rubber joint over each end of hte existing pipe whether existing plastic or metal. Then you install two hose clamps over each section of existing pipe. Place the tee or new section of replacement pipe into the cut our area. Then slide the boots over each end and clamp down the hose clamps on each end. You then have a well fitting pipe.

Hope this helps

Wg