Side-Entry vs Bottom-Entry Fill Valves: Which Fits Your Cistern
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A dual-flush button looks simple from the top of the cistern lid, but underneath it is doing a more complicated job than a single-flush handle ever had to. Pressing one half of the button needs to trigger a short flush, while the other half needs to lift the flush valve fully for a complete cycle, and the mechanism that makes this happen is usually either a rigid spindle or a flexible cable running down to the flush valve itself.
Specifying a fill valve replacement sounds like a simple job until the plumber gets to site and finds the water supply enters the cistern from an unexpected direction. Fill valves are built around one of two entry positions, side-entry or bottom-entry, and the wrong choice means either a valve that will not connect to the existing pipework or one that fouls the cistern wall on the way in.
Stocking a van for toilet and cistern repairs means making a constant judgement call between carrying a handful of universal parts that fit almost anything, and carrying brand-specific parts for the jobs where nothing else will do. Getting that balance wrong either means a van weighed down with slow-moving stock or a plumber turning up without the one part a job actually needs.
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's seat spares range covers most of what a trade buyer will meet on a typical round.
Start with the fill valve. This is the mechanism that lets water into the cistern after a flush and shuts off once the tank reaches the correct level, usually via a float or a diaphragm. When a fill valve wears, the most common signs are a hissing or trickling noise that continues long after the cistern should have stopped filling, a water level creeping up to or past the overflow pipe, or a float arm that no longer rises high enough to trigger shut-off. Mineral deposits inside the valve seat are often the culprit, particularly in hard water areas, and once the seal degrades a full replacement is usually more reliable than trying to clean it out.
A dual-flush button looks simple from the top of the cistern lid, but underneath it is doing a more complicated job than a single-flush handle ever had to. Pressing one half of the button needs to trigger a short flush, while the other half needs to lift the flush valve fully for a complete cycle, and the mechanism that makes this happen is usually either a rigid spindle or a flexible cable running down to the flush valve itself.
Specifying a fill valve replacement sounds like a simple job until the plumber gets to site and finds the water supply enters the cistern from an unexpected direction. Fill valves are built around one of two entry positions, side-entry or bottom-entry, and the wrong choice means either a valve that will not connect to the existing pipework or one that fouls the cistern wall on the way in.
Stocking a van for toilet and cistern repairs means making a constant judgement call between carrying a handful of universal parts that fit almost anything, and carrying brand-specific parts for the jobs where nothing else will do. Getting that balance wrong either means a van weighed down with slow-moving stock or a plumber turning up without the one part a job actually needs.
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's seat spares range covers most of what a trade buyer will meet on a typical round.
Start with the fill valve. This is the mechanism that lets water into the cistern after a flush and shuts off once the tank reaches the correct level, usually via a float or a diaphragm. When a fill valve wears, the most common signs are a hissing or trickling noise that continues long after the cistern should have stopped filling, a water level creeping up to or past the overflow pipe, or a float arm that no longer rises high enough to trigger shut-off. Mineral deposits inside the valve seat are often the culprit, particularly in hard water areas, and once the seal degrades a full replacement is usually more reliable than trying to clean it out.
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