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Fixing centres, meaning the distance between the two mounting holes in the pan, is the measurement that actually determines whether a seat will fit at all, and it varies enough between manufacturers that assuming a standard spacing is a common source of returned parts. The two most frequently seen spacings in the UK are around 140mm to 145mm and 160mm to 165mm centre to centre, and a seat bought for the wrong spacing simply will not sit over both holes.
Learn more at electric shower spares supplier.
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.
Cable-actuated systems use a flexible cable in place of the rigid spindle, which allows the button to be positioned somewhere other than directly above the flush valve, useful on concealed cisterns and certain close-coupled designs where the lid mechanism does not line up with the valve beneath. The cable itself can stretch, kink or seize inside its outer sheath over time, and a button that has become stiff, or one that no longer springs back after use, usually points to the cable rather than the flush valve itself.
A flush valve, by contrast, works as a straightforward seal at the base of the cistern that lifts to let water fall directly through into the pan under gravity, with no siphoning action involved, and shuts again once the float or timer mechanism allows it to reseat. Flush valves are what almost all dual-flush cisterns use, since a siphon's all-or-nothing action makes a genuine short flush difficult to achieve, whereas a valve can simply be held open for a shorter or longer period.
On button-actuated cisterns with a rigid spindle, the button sits directly above a plastic or metal rod that passes through the cistern lid and connects to a lever arm on the flush valve below. Pressing the small button rotates or depresses the spindle partially, lifting the flush valve seal just enough for a short flush. Pressing the full button pushes the spindle further, lifting the valve completely so the cistern empties in one go. Wear at the point where the spindle meets the flush valve lever is the most common failure here, often showing up as a button that clicks but produces no flush, or a short flush that no longer fires at Plumb2U all while the full flush still works.
Learn more at electric shower spares supplier.
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.
Cable-actuated systems use a flexible cable in place of the rigid spindle, which allows the button to be positioned somewhere other than directly above the flush valve, useful on concealed cisterns and certain close-coupled designs where the lid mechanism does not line up with the valve beneath. The cable itself can stretch, kink or seize inside its outer sheath over time, and a button that has become stiff, or one that no longer springs back after use, usually points to the cable rather than the flush valve itself.
A flush valve, by contrast, works as a straightforward seal at the base of the cistern that lifts to let water fall directly through into the pan under gravity, with no siphoning action involved, and shuts again once the float or timer mechanism allows it to reseat. Flush valves are what almost all dual-flush cisterns use, since a siphon's all-or-nothing action makes a genuine short flush difficult to achieve, whereas a valve can simply be held open for a shorter or longer period.
On button-actuated cisterns with a rigid spindle, the button sits directly above a plastic or metal rod that passes through the cistern lid and connects to a lever arm on the flush valve below. Pressing the small button rotates or depresses the spindle partially, lifting the flush valve seal just enough for a short flush. Pressing the full button pushes the spindle further, lifting the valve completely so the cistern empties in one go. Wear at the point where the spindle meets the flush valve lever is the most common failure here, often showing up as a button that clicks but produces no flush, or a short flush that no longer fires at Plumb2U all while the full flush still works.
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