Dehumidifier Drain Line

**amchap** · 07-07-2009, 09:00 AM

I'm trying to connect a drain hose from my dehumidifier to the drain pipe under the sink. Here's a photo and a drawing (with measurements) of what it looks like currently under the sink.

I'm a total beginner at plumbing, so appreciate any help. I've searched this forum, and others, looking for someone doing something similar. The closest I can find is installing a dishwasher, where people add a tailpiece with a branch in it to connect the dishwasher drain hose. So that's what I'm trying to do, but I have a couple of questions.

Q1. Can I add an extra tailpiece with a branch in it, between A & B? Obviously I would need to add a corresponding length between B & C, making the P Trap lower. I have the clearance, but does this cause a problem with drainage?

Q2. If I can't do that, can I replace the existing tailpiece with one that has both a branch to connect the dehumidifier hose and a pop-up linkage? Will that involve replacing the existing sink drain?

Any and all advice appreciated. Thanks.

Alex

hj · 07-07-2009, 09:44 AM

You need a 1 1/4" threaded branch tailpiece. But unless the dehudifier has a pump or is higher than the sink it will not drain, AND the sink water WILL drain into the humidifier.

**amchap** · 07-07-2009, 10:01 AM

Thanks. I plan to put the dehumidifer on a counter at the same height as the sink counter.

So should I replace the existing tailpiece with a 1 1/4" threaded branch tailpiece, or can I just add that between A & B?

If I have to replace the existing one can I get one with a pop-up sink drain as well as the branch?

Alex

**kingsotall** · 07-07-2009, 10:05 PM

It's gonna be tight, real tight but you just might be able to sandwich a branch tailpiece in there but yeah that is the way to go about it. It would be between A and B. Man thats going to be tight.