Side-Entry vs Bottom-Entry Fill Valves: Which Fits Your Cistern
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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.
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.
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.
Available space inside and around the cistern also narrows the choice. A shallow cistern with limited depth may not give a bottom-entry valve enough room to seat correctly, while a side-entry valve needs clear wall space at the right height with no other fittings in the way.
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.
A bottom-entry fill valve, by contrast, takes its supply vertically through the base of the cistern, www.plumb2u.com 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.
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.
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.
Available space inside and around the cistern also narrows the choice. A shallow cistern with limited depth may not give a bottom-entry valve enough room to seat correctly, while a side-entry valve needs clear wall space at the right height with no other fittings in the way.
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.
A bottom-entry fill valve, by contrast, takes its supply vertically through the base of the cistern, www.plumb2u.com 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.
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