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How do I change a side entry fill valve in my toilet cistern

Welcome to this guide to replacing the side entry fill valve in your toilet cistern.

Below you will find  step by step instructions on how to change a side entry fill valve in a toilet cistern and a list of toilet manufacturers that this side entry fill valve from FlushKING will fit.

If the toilet in these instructions, or video does not look exactly like your toilet cistern dont worry, the mechanics inside are all very similar.

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  • Fits all toilet manufacturers below
  • Anti syphon prevents back flow and contamination of water supply
  • Fully adjustable float to set the water level you need
  • Consistent quiet flow
  • Saving water will save you money if on a water meter
  • More reliable than old ball valves with levers & floats
TowelPlumbers GripsFlat head Screwdriver

Tools you will need

You will find that FlushKING products are simple to fit without tools, however you will need to have tools ready to remove the old valve from the toilet. You will need a pair of grips, a flat head screwdriver and a towel.

If you are looking to replace just the fill valve then you will need one of the two products below. You can check what product you need by looking at your existing cistern and identifying where the flush is currently placed.

Type of toilet cistern Product you need Type of toilet

Top fixed button

Any toilet cistern with a water supply on either side as highlighted.

Side Entry Fill Valve

Side Entry Fill Valve

This fill valve will fit most toilet cisterns where the water supply connects to the cistern on the side , wherether the hole is on the left or the right.

Bottom entry fill toilet cistern

Any toilet cistern with a water supply connecting at the bottom of the toilet cistern.

Bottom fill valve, adjustable with brass shank

Adjustable Bottom Fill Valve - Brass Shank

Cisterns that have the water connection connecting on the bottom of the toilet cistern will use bottom fill valves. The example used here is fully height adjustable, and has a robust brass connection shank. You can also use the adjustable bottom fill valve with plastic shank if you are looking for a cheaper alternative. And if you cistern is not limited on height, you can also opt for the basic standard bottom entry fill valve which is plastic shanked and non-adjustable in height.

It is a good idea, while you are isolating the water supply to your toilet cistern to consider changing your flush valve, if you have an old syphon flush these are generally single flush and waste a lot of water. Below are the products you would need to change the flush valve, the flush valve is in two formats, top fixed flush valve and flexi-mount cable flush. You can check what type of flush valve you need by looking at your cistern for how it flushes and compare it below..

Type of toilet cistern Product you need Type of toilet

Top fixed button

Any toilet cistern lid with flush button on the top & center.

Top Push Button Flush Valve

Top Press Dual Flush Valve

This flush valve will fit most top push flush button cisterns. It is recognized by the fact the cistern is fitted directly to the top of the toilet pan, and has a push button on top of the cistern lid as pictured left.

Lever flush cistern

Any toilet cistern with a lever flush in any of the positions highlighted.

Flexi Mount Dual Flush Valve

Flexi Mount Dual Flush Valve

This flush valve will fit most lever flush cistern, and with its flexi-mount cable the flush button can be placed wherever the flush lever used to be. This is also the case with concealed cisterns that may be fitted inside cabinets or stud work with abutton on the fascia our countertop.


Step by Step

Turn off the water Step1: Check that you order the correct fill valve for your cistern type, when you have removed the cistern lid, look inside. Does your water connection pipe enter it at the bottom of the cistern? left or right makes no difference, it will either be from the bottom or the side. Use the comparison matrix above to compare to your toilet cistern.

For this how to guide we will use the FlushKING side entry fill valve.

Locate the old side fill valve Step 2: When you look at your side entry cistern you will see a water supply pipe entering the cistern from either left or right, and the same applies for a concealed cistern, a close coupled toilet or even a low level toilet. On the inside of the cister, connected through the wall of the cistern is the fill valve, if this is letting water by constantly, or not opening even, it is time to replace it with a more efficient bottom fill side entry that allows you to adjust the water level and fills through a solid pipe from the bottom up making it a lot quieter. This cistern is fitted with on old Torbeck fill valve, but this guide is the same if you have a long arm with a float.

Locate the service valve and switch the water off Step 3: The first job on a plumbing job is to locate the nearest isolation valve or stopcock and turn off the water supply to the toilet.

You should have an isolation valve as pictured, which may be straight or bent but will have a flat head slot to turn 90º to switch it off (if you don't have one, now may be the time to fit one whilst the water is being turned off.

In the meantime locate your house water stopcock (usually under the kitchen sink) and turn off the water.

 Flush the toilet to empty the cisternStep 4:  Flush the toilet to drain out any water in the cistern, and ensure the water is fully off by checking the cistern isn't filling again.

You shouldn't need to towel out any water that is left in this installation as the fitting connects in from the top.

If you want to do it, it is a good idea to remove any debris or scale that may have built up in the bottom of the cistern.

Disconnect the water supply Step 5: Now you are ready to disconnect the water supply from the fill valve on the outside of the cistern, take your grips (or an adjustable spanner) to the nut on the isolating valve or tap connector that is screwed onto the side of your fill valve and turn it anti-clockwise till it loosens enough to undo the rest by hand.

You will get a small amount of water that is trapped in the pipe leak out, so make sure your towel is below to catch this.

Remove the back nut securing the old fill valveStep 6: You are now ready to remove the old, faulty fill valve as it is only held into the cistern with a plastic back-nut (normally plastic to prevent the cistern getting damaged). You should be able to undo the back-nut by hand as it only needs to be hand tight, but if it is being stubborn due to old sealants, use your grips to loosen it. remove the nut completely and discard as your new unit will have its own back-nut in the box.

You should now be able to remove the old fill valve, this one was an upturned cup Torbeck style. Step 7: The fill valve should now lift out without any resistance at all, and make sure you remove any old rubber washer from inside the cistern that may be perished and stuck around the hole you now have in the bottom of your cistern, Take a bit of time now to clean around the hole inside the cistern and also underneath it, you will be need it to be smooth and clean to get a good water tight seal when the new FlushKING unit goes in.

 remove the back-nut from the new FlushKING side entry fill valve leaving the cone washer in place Step 8:  Remove the white plastic back-nut from your new FlushKING fill valve and select the black rubber washer that fits best into the hole on your cistern, there are two to choose from, a cone washer and a flat washer and between them they should seal all inlet holes available.

Place the chosen washer on the threaded shank with the flat side to the valve body.

Place the new FlushKING fill valve into position, ensuring the float is free to move Step 9: Place the threaded shank through the hole in the cistern and secure with the plastic back-nut firmly, but hand tight so as not to crack the cistern, the rubber washer should seal the gap this way.

If you should find any weeping once water is switched back on, check the seating of the washer and tighten to ensure it seals.

Reconnect the water supply onto the new fill valve.Step 10: Now reconnect the water supply by screwing the female nut back onto the plastic threaded shank, check your service valve or tap connector to make sure the washer is in good condition, if it is old it may have perished.

Once you have reconected it give it a wipe around with a piece of tissue so you can tell if the join is leaking or not once the water is turned on.

turn on water, check for leaks and that the cistern fills correctlyStep 11: Turn the water supply back on at the service valve or stopcock depending how you turned it off originally and wait for the cistern to refill. Once the water stops filling, check all joints to make sure you have no leaks, check around the water connection and the hole through the cistern. If you have had to wrestle off the old connection check all joints to make sure nothing has been disturbed such as the flush pipe connection to the pan.

Adjust the float using the dial as pictured until you are happy with the water level in your cisternStep 12: At the top of your new FlushKING fill valve you will see a grey arm with a green dial on top of it, this dial is how you adjust the rise and fall of the float to set the water fill level, keep adjusting this up or down until the water settles at a level just below your overflow pipe, this may be a plastic pipe exiting your cistern to a waste pipe away from the toilet or a modern internal overflow flush valveOnce you are happy with the water level and checked underneath for any leaks you can replace the cistern lid and your done!


Fits all these toilet manufacturers cisterns

Twyfords logo Fits most Roca Cisterns Fits most Ideal Standard Cisterns Fits most Armitage Shanks cisterns Fits most Ideal Cisterns Fits most Shires cisterns Fits most Lecico cisterns Fits most Macdee cisterns Fits most Thomas Dudley cisterns Fits most duravit cisterns Fits most Vitra cisterns Fits most Bauhaus cisterns Fits most Eastbrook cisterns Fits most Rhoper Rhodes cisterns Fits most Bristan cisterns Fits most Hudson Reed cisterns


Did you know?

Levels of Water StressThe Environment Agency has developed a methodology for identifying and classifying relative levels of water stress in water company areas in England. The Government has used this map to designate areas of serious water stress for the purpose of accelerating water metering.

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