[adamrobertson]

I'm replacing my kitchen sink and although it's the same size, the drain holes in the old sink were near the front and the drain holes in the new sink are near the back. Anyway, the P-Trap is forward about 8 inches or so. I was told I can simply cut the pipe coming out of the wall and refit it to the P-Trap. However, I have a large vent that prevents me from shortening anything to move the P-Trap. What can I do to move everything back 8 inches?

[adamrobertson]

Sorry, the image didn't come through.

[ballengerb1]

Have you tried to rotate the trap a half turn? That will bring it back about 8" buit not centered where it was.

[adamrobertson]

Thanks ballengerb1. That brings it about to where it needs to be, but as you mentioned it's not centered where it needs to be. Do they sell lower profile traps that don't take up as much depth?

[hkstroud]

I am assuming that this is a double bowl sink. You are going to have to do some re-piping. Cut the AAV off. Cut off right at the shoulder of the AAV. It looks like you will have enough pipe coming out of the wall to put an new fitting on before hitting the back of the cabinet.
Put the baskets in the sink with tail pipes and pipe between the bowls. Put trap on the right hand bowl. Sit sink temporarily in place. Turn trap so the output is looking at the pipe coming out of the wall. The trap does not have to be put front to back. It can be turned left or right and then the output 90 turned to look at the drain. This can save space front to back. If it is turned to the right, that not only saves you space front back, it increases space between the trap and the drain pipe. You may or may not need the space to get the AAV in.

Put a 45 ell on the drain pipe and put a short piece pipe in it. If the output of the trap can be made align with the short pipe coming out of the 45 measure between the two and make up a piece of pipe with a new AAV.

If the 45 ell is too much of a turn, use two 22 1/2 ells. By turning one of these up and the other down you can reduce the amount of turn. Just be sure that you keep your flow in the correct direction.

Dry fit everything. When you have every thing fitted together make marks on the fittings and the pipes so you will know how to turn them when you glue them up.


What is the other drain pipe and trap underneath the sink drain?

[adamrobertson]

Thanks! This, for the most part makes sense. I'm new to this and have a quick question though. What would prevent me from keeping things as is except running a 90 degree from the top of the trap backwards and then another 90 degree up to the basket in the sink? I'm sure it's both technically wrong and wrong according to code, but I just thought I'd ask.

[hkstroud]

I think I know what you are saying but not sure. For one thing we don't like 90 ells. Tend to get clogged.
Next suggestion would be to cut AAV out. Put a street 45 on pipe, point to the right. Put tee for AAV on 45. Come out of tee with another street 45, pointing back toward the trap. That should put you in the area of the trap. Again if 45 is too much of a turn, use two 22 1/2 ells out of the tee.

[adamrobertson]

Ahhh, I like that route! Just to brainstorm, what if I kept everything as is, rotated the trap 90 degrees so it's perpendicular to where it is now (that would probably gain me around 6-8 inches, and then used a center outlet to connect to each of the two drains? Your second suggestion seems like the best bet though.

[hkstroud]

Good idea but don't think it will work. If you have arms on both sinks they will have to come together in a tee at the top of the trap. Therefore the top of the trap would have to be directly underneath the sink arms. Perhaps I am misunderstanding.

[hkstroud]

I guess the output of the tee could be horizontal, then you could pipe to the trap. Puts more turns in line though.
Over all I think second suggestion is less work and neater.

What is other drain?

[adamrobertson]

I was thinking something like this (each arm would need to be adjusted obviously to be centered under each drain), but I think I'll go with your option 2. Off to HD tomorrow. Thanks for all of the help.