Free a Stuck Shower Cartridge
Using a rubber drain-pipe coupling as a full-surface grip to turn out a seized shower cartridge that a wrench can't budge.
Stop a Toilet Running Nonstop by Checking the Flush Valve, Not Just the Flapper
A flapper that keeps getting replaced is the sign the seat it lands on is worn out. Water leaks past the flush valve itself, and no new flapper will seal against it.
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The Problem
A toilet that runs constantly has two likely causes, and almost everyone fixes the cheap one repeatedly before finding the real one.
The flapper gets replaced first, because it's a few pounds and it's the part everyone knows. When that doesn't hold, the handle gets replaced, then the chain gets fiddled with. The creator went through exactly that cycle over several years on one toilet.
The second cause is the part underneath: the flush valve, the large fitting in the centre of the tank that the flapper seats against. When its seat is worn or degraded, water passes straight through it regardless of what's sitting on top — so a brand-new flapper landing on a worn seat still leaks, and the symptom looks identical to a bad flapper.
The Technique
The diagnosis is the useful part, because it tells you whether to buy a £5 part or a £25 one.
- Take the lid off and watch where the water is going. If the tank refills periodically with nothing draining visibly past the flapper, water is escaping somewhere at the bottom.
- Press down firmly on the flapper with the tank full. If the running stops while you're holding it, the flapper isn't sealing. If it keeps running, the leak is past the flush valve itself and a new flapper won't fix it.
- Look at the flush valve seat — the ring the flapper lands on. Run a finger round it. Pitting, roughness, or a chalky deposit means it can no longer make a seal.
- If you've already replaced the flapper once and the problem came back, treat that as the answer rather than a reason to buy another flapper. A flapper failing repeatedly on the same toilet is usually reporting on the seat under it.
Pro tip: Check whether your toilet is one-piece or two-piece before you buy anything. Universal repair kits generally only fit two-piece toilets, where the tank bolts on separately. The creator bought a universal kit for a one-piece toilet, found it didn't fit, and had to order a flush valve specific to her model — several days lost to a part that looked like the obvious purchase.
Pro tip: Chain length is worth checking whatever you replace, and it fails in both directions. Too tight and the flapper is held fractionally off its seat, so the toilet trickles constantly — the exact symptom you're chasing. Too loose and the handle uses up its travel before lifting the flapper properly, giving a weak flush. You want it just slack with the flapper closed.
Safety note: Shut off the supply at the valve behind the toilet and flush to empty the tank before working in it. Tank components are brittle with age, and the porcelain around the flush-valve nut is the part that cracks — if a nut won't move, that's a moment to stop and reconsider rather than reach for a longer lever, because a cracked tank turns a running toilet into a new toilet.
Electrical, plumbing, and structural work may be regulated where you live — check local code before you start, and note that a permit may be required. More in our disclaimer.
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