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>

What is the standard size of a dishwasher?

• <div><p>A standard <a href="https://www.angi.com/articles/dishwasher-sizes.htm">dishwasher size</a> is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes. </p></div>

Best dishwasher installation pros near Purchase, NY

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Verified Reviews for Dishwasher Installation pros in Purchase, NY

*The Angi rating for Dishwasher Installation companies in Purchase, NY is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in Purchase, NY is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on September 10, 2026

Reviewed in September 2026
Al and his assistant Butch were polite and professional, they installed a GSCA outlet for a new dishwasher and they replaced a fluorescent light fixture with an LED version that i purchased. A quick and efficient job completed.
Al Angrisani Electric
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Reviewed in July 2024
Replacement glass fitment and installation was perfect. Fast turnaround, perfect service and price. Would use again and recommend for any glass needs.
Elite Glass Works
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Reviewed in April 2024
Fiori came first to give us a free assessment of the task - fixing the kitchen drain and its connection to the dishwasher. He explained clearly what our options were, the pros and the cons, and gave us estimates for the different options. He then came back at the time scheduled and did a full...
Reliable Pipe Repair & Drain Cleaning, Inc.
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Reviewed in August 2023
This contractor was clean , prompt and quickly installed my water heater. No non sense kink of company.
Roni Mechanical
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Reviewed in November 2022
Fast install of a quality door and it included removal of old door. Left the job clean. Door works great and looks great
DoorSnobs
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Reviewed in November 2022
install is scheduled for 12-1-22 and 12-2-22.
John Calvo, Inc.
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Reviewed in August 2022
ARRIVED FOR THE APPOINTMENT ON TIME. PERFORMED THE WORK WITH EXPERT KNOWLEDGE OF WHAT HAD TO BE DONE. NO GUESS WORK.HIS EXPERTISE SAVED ME FROM REPLACING MY DISHWASHER AT A COST OF $1700.
Edgar's Appliance Service
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Reviewed in March 2022
They worked very hard and efficiently to install a washer and dryer into a very tight space. Friendly and arrived on time and worked with my schedule.
Metropolis Plumbing and Heating
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Reviewed in December 2021
Installed Water Heater bought at Home Depot Price was reasonable and Arber did great job. little issue in next day but he came back right away. Installed a Kitchen faucet same time and his assistance did it great job. He cleaned up very well before he left.
Capital Mechanical
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Reviewed in January 2021
kitchen sink installation, water filtration system install
SHORELINE MECHANICAL LLC
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Top-Rated Dishwasher installation pros in Purchase - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

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.

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters.

Professional services ensure correct installation, verify water-tight seals, and safely address plumbing and electrical connections in dishwashers.

A standard dishwasher size is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes.

Installation includes leveling the unit, connecting water and electrical lines, securing the unit, and testing for function and leaks.

The Purchase, NY homeowners’ guide to dishwasher installation services

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

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