Fluidmaster 400 Model Anti-Siphon Keeps Running: Fix Guide
A Fluidmaster 400A anti-siphon fill valve that keeps running usually has debris under its cap seal, a worn Fluidmaster 242 seal, an incorrectly adjusted float, or water escaping through another toilet component. Check whether water reaches the overflow tube first, because a full tank with a running sound often indicates a leaking flapper rather than […]