This ensures that the flow doesn’t create a vacuum that could siphon the water out of the p-trap (the North American term for a trap in a plumbing line). They are one-way valves designed to allow air INTO the drain pipes, not out of them.Īs water flows down the system, the air admittance valve opens, allowing air to enter through it and into the drain plumbing as the water flows into the gray tank. This is where air admittance valves come into play. But as the water passes through the plumbing, it needs to be able to draw air in as it goes by so that a vacuum isn’t formed. When water flows down a drain, it fills the space previously occupied by the air. Air admittance valves allow air into the system through a one-way valve, allowing water to flow smoothly and preventing the formation of a vacuum in the plumbing system. What Are Air Admittance Valves and How Do They Work?Īir admittance valves are critical components in plumbing systems… not only in RVs but also in standard residential plumbing. If you smell a foul odor and follow your nose to the area under your RV’s sink, you may have discovered a bad air admittance valve. Air admittance valves are often a part of this engineering, so if you’re getting foul odors inside your RV it could signify a faulty valve. RVs have plumbing systems engineered to vent odors to the outside. When this combination sits for extended periods, it’s a recipe for odor. While an RV’s gray tank doesn’t contain raw sewage, it collects bacteria-filled dishwater, food particles, body oils, and soap. When you smell a mysterious odor in your RV, your black tank may spring to mind quickly, but it’s not always the culprit.
5.4) Use Holding Tank Enzymes to Help Break Down Waste.5.2) Regularly Clean Your Holding Tanks.5.1) Upgrade The Plumbing Vents On Your Roof.5) Other Ways to Reduce RV Holding Tank Odor.
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4) How to Replace RV Air Admittance Valves.
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