Often my toilet won't flush properly. It needs constant plunging. Also the tank doesn't refill unless I take the top off and jiggle the thingy attached to the handle, then It won't stop running unless I jiggle it again. What'r the problem?
by 
debodun
ANSWERS: 3
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There's no ballcock in the tank. There's just a cylindrical device that slides up and down as the tank empries and refills.
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You probably need to replace the flapper that seals the drain hole at the bottom of the tank. If the flapper is corroded to the point where it's not forming a watertight seal in the drain hole then water is slowly leaking though it. That means even if the water reaches a level high enough to shut off the refilling it'll eventually drain back down to a level that restarts it.
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You need a new ballcock and a new flush handle in the cistern - that's the thingy and the handle attached to it! I would seriously NOT attempt to fix this yourself if you've no knowledge of plumbing... could be a very costly job of you get a leak! The parts aren't expensive, so if you know someone who can do it for you - great! Otherwise, fork out for a CORGI regisitered plumber (in the UK) :)
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