Side-Entry vs Bottom-Entry Fill Valves: Which Fits Your Cistern
Ramiro Bladen
2026-08-25 14:37
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You can find out more via Plumb2U Epsom.
A flush handle or lever that has stopped working properly is one of the more straightforward toilet faults to diagnose, but plumbers still lose time on it when the replacement lever does not match the flush valve fitting already in the cistern. Before reaching for a new part, it is worth ruling out a simple adjustment first.
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.
More information is available at Plumb2U Epsom.
Before ordering, check where the existing supply pipe meets the cistern and measure the available depth if the tank is compact. Plumb2U stocks both side-entry and bottom-entry fill valves, including combination types that cover both configurations from one body, at trade prices for plumbers who need to match the part to the pipework rather than the other way round. Plumb2U's range, backed by next-day despatch on the common models, makes it straightforward to specify the correct entry position before the part goes in the van.
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.
A flush handle or lever that has stopped working properly is one of the more straightforward toilet faults to diagnose, but plumbers still lose time on it when the replacement lever does not match the flush valve fitting already in the cistern. Before reaching for a new part, it is worth ruling out a simple adjustment first.
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.
More information is available at Plumb2U Epsom.
Before ordering, check where the existing supply pipe meets the cistern and measure the available depth if the tank is compact. Plumb2U stocks both side-entry and bottom-entry fill valves, including combination types that cover both configurations from one body, at trade prices for plumbers who need to match the part to the pipework rather than the other way round. Plumb2U's range, backed by next-day despatch on the common models, makes it straightforward to specify the correct entry position before the part goes in the van.
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.
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