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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
The "Venting to atmosphere" section is great! Of course, diagrams and picutres would make it even better... But the "Air admittance valve" section does not make sense -- if it only allows gases in, not out, how does it prevent back-pressure when a toilet flushes?69.87.193.156 13:05, 6 September 2006 (UTC) It doesn't.
A clogged kitchen sink can be caused by a number of things. We broke down the most common reasons a kitchen sink and pipes get stopped up—and steps you can take to remedy the situation.
Koch details how to clean your kitchen sink drain, as well as how to clear out any clogs. Meet The Expert. Jill Koch is a cleaning expert and founder the of Jill Comes Clean. What You'll Need.
This "air gap" is visible above the sink as a small cylindrical fixture mounted near the faucet. In the base cabinet under the sink, the drain hose from the dishwasher feeds the "top" of the air gap, and the "bottom" of the air gap is plumbed into the sink drain below the basket, or into a garbage disposal unit. When installed and maintained ...
Because it is a localized low-point in the plumbing, sink traps also tend to capture small and heavy objects (such as jewellery or coins) accidentally dropped down the sink. Traps also tend to collect hair, sand, food waste and other debris and limit the size of objects that enter the plumbing system, thereby catching oversized objects. For all ...