See more on this at Plumb2U Trade Counter.
Ken
2026-10-06 14:55
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See more on this at buy plumbing parts online.
A bottom-entry fill valve, by contrast, takes its supply vertically through the base of the cistern, in line with where a rising main or supply pipe comes straight up from the floor void or from beneath a low-level suite. This arrangement is generally quieter, since the incoming water enters below the surface of the tank rather than splashing in from the side, which is why many modern and replacement fill valves are built as bottom-entry as standard, often with a side-entry option built into the same body.
Before ordering, measuring the fixing centres and checking whether access beneath the pan is realistic will settle top-fix versus bottom-fix and the correct spacing in one go. Plumb2U stocks both top-fix and bottom-fix hinge sets and soft-close spares across the common fixing centres, at trade prices, so plumbers replacing seats across several jobs a week can order to the measurement rather than to a guess. As a plumbers merchants stocking both fixing types in depth, Plumb2U Trade Counter's seat spares range covers most of what a trade buyer will meet on a typical round.
When a full lever replacement is needed, the fitting type has to match what is already there. Side levers, which mount through a hole in the side of the cistern, come in different thread diameters and in both metal and plastic bodies, and the arm length inside the tank needs to reach the flush valve or siphon without fouling the tank wall. Levers that mount through the lid, more common on close-coupled and concealed designs, connect via a spindle rather than a side arm and are not interchangeable with side-lever fittings.
Bottom-fix hinges are the traditional arrangement, with a bolt passing down through the pan from above and a nut and washer tightened from underneath the rim. This means access is needed both above and below the pan to fit or remove the seat, which is straightforward on a floor-standing toilet but considerably more awkward on a wall-hung pan where the underside is harder to reach, or where a previous fitting has corroded the nut solid against the porcelain.
A cistern that never quite stops filling is one of the most common callouts a plumber gets, and the fix hinges on correctly identifying which of two components has failed: the fill valve or the flush valve. Get this wrong and you swap a part that was never the problem, then head back out a second time.
A bottom-entry fill valve, by contrast, takes its supply vertically through the base of the cistern, in line with where a rising main or supply pipe comes straight up from the floor void or from beneath a low-level suite. This arrangement is generally quieter, since the incoming water enters below the surface of the tank rather than splashing in from the side, which is why many modern and replacement fill valves are built as bottom-entry as standard, often with a side-entry option built into the same body.
Before ordering, measuring the fixing centres and checking whether access beneath the pan is realistic will settle top-fix versus bottom-fix and the correct spacing in one go. Plumb2U stocks both top-fix and bottom-fix hinge sets and soft-close spares across the common fixing centres, at trade prices, so plumbers replacing seats across several jobs a week can order to the measurement rather than to a guess. As a plumbers merchants stocking both fixing types in depth, Plumb2U Trade Counter's seat spares range covers most of what a trade buyer will meet on a typical round.
When a full lever replacement is needed, the fitting type has to match what is already there. Side levers, which mount through a hole in the side of the cistern, come in different thread diameters and in both metal and plastic bodies, and the arm length inside the tank needs to reach the flush valve or siphon without fouling the tank wall. Levers that mount through the lid, more common on close-coupled and concealed designs, connect via a spindle rather than a side arm and are not interchangeable with side-lever fittings.
Bottom-fix hinges are the traditional arrangement, with a bolt passing down through the pan from above and a nut and washer tightened from underneath the rim. This means access is needed both above and below the pan to fit or remove the seat, which is straightforward on a floor-standing toilet but considerably more awkward on a wall-hung pan where the underside is harder to reach, or where a previous fitting has corroded the nut solid against the porcelain.
A cistern that never quite stops filling is one of the most common callouts a plumber gets, and the fix hinges on correctly identifying which of two components has failed: the fill valve or the flush valve. Get this wrong and you swap a part that was never the problem, then head back out a second time.
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