Tank Fit Names the Part Making Your Toilet Run

Why it surfaced

Tank Fit replaces brand-first shopping advice with a practical sequence: listen to the tank, run a dye test, check the waterline and chain, then match the result to a part. It also names specific fitment failures, including 2-inch versus 3-inch valves, canister seals, and one-piece tanks.

A browser-based four-question diagnostic that identifies whether a running toilet needs a flapper, fill valve, flush valve seat, or another repair.