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What is A Plumbing Check Vent?
Fri 10/01/04 08:41:40 pm
by Mark Bower

A check vent acts as an air vent for a drain. For drain lines to work properly, they must draw in air for waste water to flow away without gurgling. Each drain in a home must have its own air vent. Drains get air in one of two ways -- by a vent pipe which extends up through the roof or a check vent (sometimes known as an auto-vent or a cheater vent).


In most communities, plumbing codes do now allow check vents to be used in site-built homes. HUD code does allow them to be used in manufactured homes. In manufactured homes, check vents are normally found just on sink drains. Generally (but not always) you won't find them on tub and shower drains and you should never find them on a toilet drain.

Installing a check vent is much simpler than running a pipe up through the roof. To save money, many mobile home manufacturers opt to use check vents under sinks rather than spending time to run a vent pipe up through the roof

How does a check vent work?

When water is released from the sink into the drain, the check vent opens and allows air into the drain pipe so the water can smoothly flow away. It opens by suction. However, if the drain pipe is plugged or running slow and the water starts to back-up, the check vent will close preventing any water from spilling. When not in use, the check vent remains closed to prevent any sewer gases from escaping.

How can I tell if a check vent needs replacing?

If you constantly smell sewer gases underneath your sink, then your check vent may not be closing properly and should be replaced. If you drain backs-up and you see waste water underneath your sink, your check vent may be leaking and should be replaced.

If your drain gurgles, runs slow or hisses, the problem may or may not be your check vent. Remove your check vent, set a pail underneath the pipe and then run water into your drain again. If the gurgling, slowness or hissing stops, then replace the check vent. If the drain still gurgles or runs slow, then the problem is not the check vent and more likely a plugged drain.

How do I replace a check vent?


Fortunately replacing a check vent is one of the easiest plumbing repairs you can make. Simply unscrew the check vent using a pair of big (slip-joint) pliers. To install the new check vent, first apply some joint tape or sealant to the threads and screw back in. Tighten with a pliers but don't overtighten. Generally they screw into a 1-1/2 male adapter.

Where can I buy a check vent?

Home improvement stores with a large plumbing department should have the vents available. Also mobile home parts suppliers. Or just order them by clicking HERE

Mark Bower owns Aberdeen Mobile Home Repair and is the author of "The Manual for Manufactured/Mobile Home Repair and Upgrade" available on this website.


Manufactured Housing Repair On-Line

The MH Parts Store On-Line   MH Parts may not be very pretty... but when you need them you just can't do with out them. Don't run all over town to assemble the things you need for that home renovation or repair. Order from our on-line parts store. Everything you need is here from doors, windows, screens, plumbing and electric parts, bath and kitchen fixtures, roof and ceiling components, and more.... even set-up materials, The Part Store's Owner/Managers, keep it simple, they just provide you with the best possible products available.

The Manual for Manufactured Home Repair & Upgrade   If your looking for a book that covers all facets of manufactured home repair, you've found it! This is the only book of its type, available to the public, that we have been able to find. As you would expect from the title, The repair and upgrade techniques described in this manual are specific to manufactured homes. This book will answer almost every question on manufactured home repair that we have ever heard. Not only does this book show you how to repair and maintain your home, but also great methods for upgrading it.

The Manufactured Home Repair & Renovation Forum   An open discussion group where all are welcome to participate. No registration necessary! Discussion threads covering a wide range of questions, answers, and relating of personal experiences involving MH Repairs. Ask our experienced manufactured home repair and renovation contractor about your home repair needs! Basic home fix-it techniques to trade secrets.

Advanced Foundation Systems   Designed and engineered for manufactued homes, These foundation systems add a high level of strutural stability and have proven most cost-effective for the manufactured home, buyer. Advanced Foundation Systems meet or exceed industry standards, and have been proven safer under adverse conditions. Advanced Foundation Systems offer you the best foundation technology available for your manufactured home...plus added safety and stability...at a lower cost.

Finance Your MH Renovation/Repair   There are many loan programs available to MH Owners. Secure the money you need to renovate, upgrade, or even expand your MH. One stop shopping. select your loan preferences and we will forward your request for loan information to as many as a dozen participating manufactured housing finance offices.

Skirting For The 21 Century Manufactured Home   System-1 is what skirting should be- 100% solid concrete. System-1 is not an imitation or a look alike it is the original concrete skirting system that resists the elements from the summer heat of Texas to the harsh winters of Minnesota. System-1 is built to last and is designed to stay put for years of dependable service. Stop chasing your skirting down the street and look at just some of the benefits System-1 concrete skirting provides you.

MH Free Classifieds PARTS & SERVICE Section   Parts & contractors for the repair, renovation and installation of manufactured homes. Parts and component suppliers... and more

Hardboard Siding Repairs   Does your Manufactured Home have hardboard siding that is swelling, rotting, or buckling? You might be entitled to a Cash Settlement! Find out if you qualify HERE

Manufactured Housing Yellow Pages / SERVICE COMPANIES   The Yellow Pages is an ever expanding data base that is growing into one of the richest resources in the world for locating and contacting companies that participate in, or offer services to, the manufactured housing industry.

The Mobile Home Expert   The business of installing and servicing manufactured homes is rapidly moving away from the world of the one pick-up, one jack, local set up and repair guys and into the world of certified tradesmen, and licensed contractors. The modern manufactured home is greeted with stiff compliance codes regulating construction, warranty and installation. As more and more local agencies get involved in the inspection of installations it gets more and more difficult to know what the rules of the game are, especially if your operating in more than one jurisdiction. Consult with R.T. Bonney, who has participated in all phases of the industry over the past 30 Years He can provide solutions for the modern problems of operating most types of manufactured housing business.

Liquid Roof   The ONLY True Liquid EPDM Rubber In The World. The "Do-It-Yourself Solution". Fix Leaks, Seal and Protect Surfaces: Add up the savings.....One Coat Application

Restore Vinyl Siding   Vinyl ReNu is the solution if your vinyl siding is faded, discolored, oxidized, chalky, or covered with mold, mildew, or fungus, and other potentially health-hazardous micro-organisms. Vinyl ReNu is unconditionally guaranteed to protect your vinyl siding for 10 years. Vinyl ReNu offers homeowners more than a vinyl siding cleaner. Vinyl ReNu restores and protects vinyl siding. CLICK HERE learn more about Vinyl ReNu

Floor Repair Info Kit   includes a 25 minute VHS video about repairing the floor underneath your toilet, and a booklet on floor repair. Price:$25.95 - Shipping & Handling:$3.90

Painting and Texturing Paneled Walls   By following the steps in this 20 minute video, your paneled walls will look darn near like textured sheetrock. Works on both wood paneling and vinyl-covered paneling or sheetrock. Price:$19.95 Shipping & Handling:$3.90


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