Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

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Verified Reviews for Sink Repair pros in Ewing, NJ

*The Angi rating for Sink Repair companies in Ewing, NJ is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sink Repair needs.

*The HomeAdvisor rating for Sink Repair companies in Ewing, NJ is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sink Repair needs.

Last update on April 16, 2026

Reviewed in April 2026
Prompt, professional service with great repairs
Dave's Handyman Services
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Reviewed in September 2025
Showed him wat kind of sink and wanted it installed in a small place. He made it possible for me. Vert satisfied. Above all he left the room spotless. Organized and clean all done in a day.
RAMIREZ FAMILY CONSTRUCTION LLC
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Reviewed in April 2025
Repaired cinder block wall that was damaged by a forklift.
Bustin Concrete and Masonry Restoration
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Reviewed in April 2024
Aqua Joe is a highly dedicated and skilled plumber. He did a variety of plumbing repairs and was thorough and efficient. I would highly recommend him.
Aqua Joe Plumbing & Drains LLC
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Reviewed in February 2024
I had a bathroom remodel that went badly so I needed help to fix the poor workmanship. Bryan sent the right man for the job, made the repairs, regrouted the floor, and fixed what was needed to make the job look so much better, at a reasonable price. I would recommend Bryan's for quality work.
Bryan's Handyman & Home Improvement Service
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Reviewed in February 2024
He came quickly and discussed cost prior to repair
Bryan's Appliance Service
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Reviewed in October 2023
PRDR sent out a handyman the next day after I called, to address a small leak under my sink. He was prompt and skilled, and he was able to fix the leak and realign the garbage disposal in record time. I even asked him to fix a cabinet door, and our screen door, which he did without hesitation. ...
PRDR Construction
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Reviewed in April 2023
Igor is the best the repair person in the area. He was able to fix my gas fireplace in a short amount of time. He explainss the problems and showed me the broken pieces. I would recommend this company.
Platinum Pro Chimney, LLC
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Reviewed in December 2022
Tony did an amazing job fixing water damage in our MBR ceiling and laundry room and painted . The drywall repair looks amazing and Tony was great to work with
Absolute Quality Painting and Contracting
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Reviewed in July 2022
Hired them for kitchen sink drain pipe replacement. Very prompt and completed the job Professional was very polite and knowledgeable
Hutchinson Plumbing Heating Cooling, LLC
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Sink Repair questions, answered by experts

Installation typically takes 1-3 days, while repairs can be completed in a few hours to a day.

Replacing the countertop with another that fits the same size and cut out shouldn't take longer than four to five hours. The installation job entails removing the plumbing connections, unscrewing the old sink connectors, removing the countertop, placing and gluing the new countertop, and connecting the plumbing hookups.

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

Yes, a toilet, sink, and shower can share the same vent. This is a common installation method that can simplify plumbing and save space. However, there are important considerations. The vent and associated plumbing must be large enough to handle the demands of all fixtures without compromising the vent's effectiveness. Additionally, the toilet should always be located downstream of all other fixtures. Because requirements can vary and space might be limited, it is essential to check your local building and plumbing codes and consult with a qualified plumber to ensure the installation is done correctly.

Yes, plumber's putty ensures a solid bond between the drain assembly and sink. Silicone is a good alternative if you prefer not to use plumber's putty. However, plumber's putty typically isn't visible from the outside of the drain, as you can wipe away any excess when done.

The Ewing, NJ homeowners’ guide to sink repair services

From average costs to expert advice, get all the answers you need to get your job done.

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