After changing kitchen sink pipes, it drain slow.


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Old 12-19-22, 05:09 PM
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Unhappy After changing kitchen sink pipes, it drain slow.

I change the 2, strainers
the p-trap, and a connector that connect the 2 strainers and the dishwasher to the p-trap. There is no leak, the p-trap is empty. But from the strainers, I can see the orange washers and part of the tubing.(white)
it drain very slowly, it did not do that before I change all these. My idea is the orange washers are too larges (blocking a little bit the hole), but these were the one that came with.
 
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Old 12-20-22, 06:02 AM
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Something was installed wrong. New baskets and strainers should not cause the sink to drain more slowly. Without pictures I can't say what you might have gotten wrong. You can see down the drain to the white pipe so that could be normal. You should not be seeing much if any of the washer when you look down the drain.
 
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Old 12-20-22, 08:06 AM
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It might be a slope problem, but I am not sure how to address it. I would need to add 1/4 in down to that side.
I might need a extension 1/4 in pvc pipe, one end need to be male 1-1/2-in the other end 1-1/2-in female? Is it a good idea?

 

Last edited by tito458; 12-20-22 at 08:31 AM.
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Old 12-20-22, 10:47 AM
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You might need longer tailpiece for one end. Most basket kits and drain kits have very short ones but you can buy just the tailpiece. They come long and you cut off what you don't need. Just make sure you get a tailpiece because the drain pipe sections look very similar.
 
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Old 12-20-22, 05:34 PM
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Thanks, I got a Oatey 6" extension tube. I put it before the P-trap. SO I was able to get the pipe to the wall a little more angle downward.
I also replaced the orange washer with transparent one that I got from the strainers. All look good. No leaks, draining faster.
 
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Old 12-21-22, 07:24 AM
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Is it a good idea to heat the PVC pipe in order to get a good slope?
 
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Old 12-21-22, 07:33 AM
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no.

The slope is determined by how long the tailpieces are. For example, if you have a double sink with two 6" tailpieces, you might cut one of them 5 1/2" long while the other one is 6", so that one is longer (lower) and you have slope on the way to the drain.

If your trap is too low to provide the right amount of slope to the wall, you cut both tailpieces tha much shorter so that the trap is higher.

Hard to give advice when we cant see what your pipes look like or how you have it hooked up.
 
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Old 12-21-22, 09:04 AM
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You are using a drain kit that discharges from one side. That makes the pipe from the other sink basin have to travel a long distance horizontally before going down. Depending on your plumbing layout you could be better off with a center drain kit where the drain from both sinks meets in the middle.

 
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Old 12-22-22, 07:17 AM
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Here is my setup.
 
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Old 12-22-22, 07:40 AM
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First, it looks to me like you are using 1 1/2" pipe under the sink, then you are reducing it to 1 1/4" pipe above the trap. That's backward and wrong.

You need to replace the trap with a 1 1/2" kit so that you aren't getting smaller. Because I think you have a 1 1/4" trap kit.

Also to fix your pitch issue, eliminate the short piece right above your trap. Replace it with 2 short tailpieces under each basket that you will cut to length. The left side tailpiece will get cut shorter than the right side. And check to see that your trap weir has slope.
 
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