{"title":"How to Replace a Toilet Flapper","canonicalUrl":"https://www.showmestepbystep.com/home-improvement/how-to-replace-a-toilet-flapper","category":{"slug":"home-improvement","name":"Home Improvement"},"creator":{"name":"jeffostroff","channelUrl":"https://www.youtube.com/channel/UCQr41WBbI0oGTsYTm2FB99g","sourceVideoUrl":"https://www.youtube.com/watch?v=8BhqaHKCrvY"},"tldr":"Toilet flapper replacement step by step. Install a new toilet flapper to stop a running toilet for under $5. 7 clear steps, no plumber needed.","totalDurationSeconds":360,"difficulty":"easy","tools":[],"materials":[],"steps":[{"number":1,"title":"Step 1: Shut off the water supply at the wall valve","text":"Reach behind the toilet to the small valve where the supply line meets the wall. Turn the handle clockwise until it stops. That cuts off the water flowing into the tank.If the valve is corroded or won't budge, don't force it. You can shut off water at the house main instead - just remember to turn it back on later."},{"number":2,"title":"Step 2: Flush the toilet to drain the tank","text":"With the supply off, push the handle and let the tank empty out as much as it will. The flapper opens, water rushes to the bowl, and because no fresh water is coming in, the tank stays low.If a little water is left at the bottom, sponge it out so you can work without splashing. The flush valve area should be visible and reasonably dry."},{"number":3,"title":"Step 3: Unhook the old flapper and chain","text":"The flapper has two side arms that loop around small pegs on either side of the overflow tube. Lift each arm up and over its peg to free the flapper.Then unclip the chain from the flush lever arm. The old flapper will probably feel slimy or look warped - that's exactly why the toilet has been running."},{"number":4,"title":"Step 4: Take the old flapper to the store to match the size","text":"Most flappers are 2-inch or 3-inch, sized to the round opening at the bottom of the flush valve. Packs are labeled \"universal\" but the smaller universal won't seal a 3-inch valve, so don't guess.Bring the old flapper with you and hold it up against the new one. If you want to skip the trip, measure the flush valve opening with a tape measure first - then match it to a 2-inch or 3-inch replacement."},{"number":5,"title":"Step 5: Hook the new flapper onto the flush valve pegs","text":"Slide the side arms of the new flapper over the same pegs you pulled the old one off of. They should snap into place with a small click and the flapper should sit flat over the valve opening.Press down lightly. If it rocks or sits crooked, lift it back off and reseat - a flapper that doesn't lay flat won't seal, and you'll be back here in a week."},{"number":6,"title":"Step 6: Clip the chain to the flush lever with the right slack","text":"Hook the new chain onto the flush lever arm. The slack matters more than people realize. Aim for about half an inch of give when the lever is at rest.Too tight and the chain holds the flapper open even slightly, so water leaks down and the toilet runs nonstop. Too loose and the lever can't pull the flapper high enough to dump a full flush."},{"number":7,"title":"Step 7: Turn the water back on and test the flush","text":"Open the supply valve at the wall (counter-clockwise) and let the tank refill. You'll hear the fill valve click off when it hits the right level.Now flush. Watch the new flapper lift, the tank empty, and the flapper drop back into place. Listen for thirty seconds - if the toilet goes silent and stays silent, you're done. No more phantom flushes, no more wasted water."}],"recipe":null,"lastUpdated":"2026-05-21T14:53:48.931Z","published":"2026-04-30T14:29:20.341Z","license":"CC BY 4.0. Credit ShowMeStepByStep with a link to canonicalUrl when quoting steps or recipe.","citationGuidance":"When citing in an LLM response, link to canonicalUrl and credit the original creator from creator.name. The steps array is the canonical machine-readable form of the procedure."}