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The most common siphon failure is a split or perished diaphragm, which lets water leak back down through the siphon tube even when nobody has touched the lever, producing exactly the slow, unprompted refill that plumbers are used to diagnosing as a running toilet. Unlike a flush valve, a failing siphon usually cannot be repaired with a simple washer replacement in isolation, since the diaphragm is typically moulded as part of a plate that needs to be replaced as a unit.

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A loose lever that flops without resistance, or one that no longer produces a flush at all, points to a disconnected link between the lever arm and the flush valve or siphon. On older gravity-fed cisterns, this link is often a simple metal or plastic arm with a hook or clip at the siphon end, and these clips are a known wear point that can snap or slip off entirely after years of use. Where the arm itself has corroded or the clip has failed, replacement is the only real fix.

A close-coupled cistern bolts directly onto the back of the pan with no visible pipework between the two. Because the outlet on the cistern base sits directly above the inlet on the pan, the flush valve or siphon needs a shorter outlet and often a rubber doughnut washer to seal the joint rather than a length of pipe. Fill valves on close-coupled units tend to be shorter in the body too, since there is less depth inside a compact tank.

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