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Cold water cisterns, where the float valve outlet must be above the overflow water level. The previous practice of taking a "silencing tube" from the float valve to under the water level is no longer acceptable. Under some plumbing codes. Such silencing may still be acceptable if it is a soft collapsible tube which cannot syphon.
Toward the end of the discharge process, the ballcock responds to the drop in water level and refills the tank. Should the float or valve fail and allow the water level to exceed the fill line, the water will pour into the overflow tube and out to the bowl (in the flapper valve type) or to an outside drain (in the siphon type).
It's not an "overflow valve". If the level in the tank gets too high (maybe the float valve failed), then the tank water height gets above the height of the overflow tube and the excess water runs down the overflow tube and into the bowl. Ultimately, the water will pass from the bowl through the siphon and into the sewer.
Generally, a toilet outlet has the shortest trap seal, making it most vulnerable to being emptied by induced siphonage. An additional risk of pressurizing a system ahead of a waste stream is the potential for it to overwhelm a downstream trap and force tainted water into its fixture. Serious hygiene and health consequences can result.
“It’s been hell. You can’t brush your teeth. You can’t wash your hands. I can’t fill up the dog’s bowl. I can’t take a shower. I can’t mop my floors. But it’s fun. I don’t need ...
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related to: toilet overflow tube keeps running fastplumbertoday.co has been visited by 10K+ users in the past month
supplyhouse.com has been visited by 100K+ users in the past month