Omnia Mechanical Group

571 Timpson Place Bronx, NY 10455

Phone: 212-534-2500

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The Anatomy of Under-Sink Traps: How They Work and What to Do About Leaks and Clogs

Sink problems are a perennial issue for New York City property owners and managers. Knowing more about how under-sink traps work will help you fix leaks and clogs, which are the most common concerns with this piece of plumbing anatomy. Here’s some expert advice from Sanitary Plumbing, so you can try some DIY repairs and save calls to us for more urgent and complicated matters.

How Under-Sink Traps Work

P-traps explained

The under-sink trap was patented back in the 18th century, although some versions of it were likely in use for hundreds of years before. Originally, the trap was shaped like the letter “S,” which later evolved in some fixtures to become the “P-trap” because it’s shaped like the letter “P.”

The purpose of the under-sink trap was — and still is — threefold:

  • To prevent sewer gas from rising up into the interior of a room through a sink or toilet by creating a small well to hold water and block odor
  • To keep hair, sediment, and other unwanted elements from going further into the plumbing system, where they are more difficult to unclog
  • To catch small items, like jewelry, that accidentally fall down the drain

Sewer gas can be more than just a nuisance odor. In large amounts, the hydrogen sulfide in the gas can make people sick with headaches and dizziness.

Most sinks today use a P-trap, while toilets use a mix of both S- and P-traps. It’s worth noting that P-traps generally function better than S-traps, as it’s easier for strong suction to pull the water out of an S-trap, thereby defeating its odor-prevention purpose.


Maintenance for Under-Sink Traps

Fewer problems with routine care

Drain maintenance is one of the most important things you can do as a New York City property owner or manager. Here are some things you can do on your own, in addition to using our regular service for large buildings, where drains can be a constant problem.

In order to maintain their usefulness in preventing odors, under-sink traps need to have a small amount of water sitting in them. Therefore, you want to use these drains regularly to replenish any lost water. So, toilets and sinks in rarely used guest rooms, for example, should get a flush or rinse once every few weeks.

All building occupants should know what can and cannot go down the drain. Some common items that form clogs include:

  • Diapers and diaper wipes
  • Feminine hygiene products
  • Cleaning and personal care wipes
  • Cooking oil and grease (especially anything that solidifies at room temperature)
  • Coffee grounds
  • Vegetable peels and food remains

Using strainers or perforated drain covers will catch unwanted items before they become problematic and also prevent the loss of earrings, rings, and small valuables that prompt calls to building management.

You’ll find P-traps in other locations besides sinks and toilets. They’re used under or behind clothes washing machines and dishwashers, as well as beneath showers and tubs, although access to these traps precludes DIY repair for most people. This is the type of P-trap job that should be done by a plumber.

If you need help with a stubborn drain clog, P-trap disassembly, or trap replacement, Sanitary Plumbing can get your drain running properly again in no time. Call us at 212-734-5000 today to schedule an appointment.

Our Privacy Policy

Omnia Mechanical Group(the “Company”) strives to ensure the highest standards for property listings and customer information privacy. Please review the following statement to learn about our company practices and policies. Please be aware that our Privacy Policy is subject to change at any time.

1. Purpose.

This Privacy Policy (“the Policy”) provides information on how the Company uses your personal information. By agreeing to the Policy, you agree to our collection and use of your personal information as described in the Policy. This Privacy Policy is effective for all new users of

2. Personal Information.

You can browse some areas of (“the Website”) without being a registered user. However, certain activities do require registration. (You consent to the transfer and storage of your information by registering with

3. Use of Information.

Our primary purpose in collecting personal information is to provide you with a safe and user-friendly experience. For example, the Company may use your personal information to:

  • Improve our services and the Website’s content and layout;
  • Provide the services and necessary customer support you request;
  • Resolve disputes, collect fees, and troubleshoot problems;
  • Track and record customer satisfaction with our services;
  • Protect the Company against error and fraud;
  • Inform you of special promotions and announcements;
  • Enforce our agreements, terms, conditions, and policies; and
  • As otherwise described to you at the time of collection.

We may occasionally ask you to complete optional surveys. These surveys are used to improve and customize your experience with

The Company always provides you the ability to opt-out of further communication such as promotions and surveys; see the Opt-Out section below.

The Company does not share any of your personal information with outside organizations, companies, individuals, etc. The only exception to this standard is if such a disclosure is reasonably necessary to respond to any and all legal processes.

4. Links to Other Sites.

The Website may have links to other websites that may collect personally identifiable information about you. The Company is not responsible for the privacy practices of the content of those linked websites.

5. Safety & Security Precautions.

The Website has strict security measures in place to protect you and your information from fraud. Once your information is provided to Omnia Mechanical Group, we strive to ensure the confidentiality of your identity and information.

6. Opt-Out.

The Company provides you with the opportunity to opt-out of receiving promotional and other non-essential, marketing-related communications from Omnia Mechanical Group. If you would like to opt-out of these select communications, please see any of the Company’s email communications and follow the directions indicated.

7. Account Protection.

Your password ensures the security of your account. When choosing a password, the Company suggests using various characters. It is highly recommended that you do not disclose your password to anyone. (If you do disclose your password or your personal information with others, you are responsible for all actions taken in the name of your account.) If the security of your password is compromised for any reason, please contact the Company immediately.

8. Accuracy of Information

The Company does not guarantee the accuracy of information for any and all of its properties on the Website, and is not responsible for any errors or misrepresentations (made by Renters, the Client, or otherwise).

9. Cookies

The Company may place a small cookie on your computer’s hard drive. This allows us to personalize your use on the Website. In order to maximize the functionality and usability of the Website, you must set your browser’s preferences to allow both permanent and temporary cookies.

10. Changing Your Personal Information.

Should your personal information change, please immediately update your information on the Website. This will ensure the accuracy of our records. The Company does retain personal information from closed accounts in order to comply with law and collect and disburse any fees owed.

11. Third Parties

This Privacy Policy addresses only the use of information we collect from you. Since does not control the privacy policies of third parties, you are subject to the privacy policies of those third parties. It is advisable that you consult with the management of third parties before you disclose your personal information to others.

12. General

We may amend this Privacy Policy at any time by posting the amended terms on the Website. All amended terms are immediately effective after they are initially posted on the Website.

13. Privacy Policy Questions & Concerns

Questions and/or concerns regarding the Policy should be emailed to the following email address: