FloPlast AV32 32mm Air Admittance Valve-Compression, White

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FloPlast AV32 32mm Air Admittance Valve-Compression, White

FloPlast AV32 32mm Air Admittance Valve-Compression, White

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One final very common issue, especially with the 110mm valves is that they are installed in the wrong place, below a point of water or waste entry. When this happens it can’t draw in the required air to balance the system and negative pressure is created along with all of its associated problems. Are Air Admittance Valves Installed Internally or Externally? When they aren’t, to fix any issues that arise, a handy product called an Air Admittance Valve is used, find out all about them and how they are used below. What is the Purpose of an Air Admittance Valve? Specific Size Air Admittance Valves: Ranging from 32mm to 110mm, these valves cater to specific pipe diameters, offering a more precise fit and seal for systems with known pipe sizes.

The air admittance valve is a one way ventilation system that allows air into the drainage system when there is negative pressure, but does not allow any air out due to a sealing mechanism, which preventing foul smells from spreading. You can, but it’ll need to be the right one. Most air admittance valves are designed only for use inside, so if you’re planning on doing this you will need to buy one that is suitable for external use. The only real reason for doing this would be if there was nowhere suitable to vent the pipe in the usual way, such as as mentioned previously, too close to a window, or not able to get above roof level. As I said before an open vent must be installed more than 3 meters away from a window and this is not always possible. In this scenario you could use an AAV that is rated for external use, as these can be placed close to the window as they will not allow escape of foul smelling gasses. To make the cut, you may find it easier to remove the entire section of pipework from its current location and do the cutting somewhere with a bit more space. This will ensure your cuts will be much straighter, however if all the fittings are solvent welded this isn’t easy as you will still have to cut the section of pipe out and then use straight couplings or joiners either end to refit it once complete. In almost all instances they are installed internally. Only those made especially for use outside can be used externally as they need to be weather and frost proof to prevent them freezing up and stopping working, in which case the above issues can occur.


Install air admittance valves at least 200mm above the highest waste water entry point on a 110mm waste pipe In most cases installing one in a standard home should be fine, the Building Regulations mainly cover extreme situations such as high-rise buildings, where there may be many waste pipes and different levels that require a fine balance to be maintained. Rubber Finger/Push-fit: The bottom of the valve features fairly stiff rubber banded bellow-like belt. The “fingers” of the belt are pushed down into the top of the pipe and grip the inside holding it in place. To ease fitting some washing up liquid is often used to help it slip down into place. As it can be easily pulled out, if there are any issues it can easily be removed for repair or replaced. One final point to mention is that there are 2 different types of air admittance valve; the large 110mm valve for use with soil pipework and a smaller 32mm or 40mm version for use on sink, bath, basin etc. smaller bore waste pipes.

First, mark the exact point on the pipe that you want the T-piece adaptor to go and then use a tape measure to measure the body section between the 2 collars. This is how much of the pipe you will need to cut away. Polypipe Soil & Vent: Anti-syphon unit (automatic air admittance valve) for Ø32mm (1 1/4'') waste pipe allows air to enter branch discharge pipes, protecting water seals in traps from effects of negative pressure and preventing self-siphonage. Next, use a tape measure to measure up 200mm and then mark the wall and then measure from the base of the collar of the T-piece up to the top mark and this is how long your vertical pipe needs to be. In the majority of cases and in most homes in the UK, the balance of pressure within a waste pipe system is maintained through a soil vent system. This is just a vertical extension of the soil pipe system that stops beyond the highest drainage point in the property.


To get the ends of the pipe in easily, if you’re working in situ, you may need to remove the pipe from any clips or push it to either side a little to create some wiggle room, however when doing this ensure you don’t strain or bend anything that could potentially create leaks.

Note: One final point to establish is that a 110mm air admittance valve will only need to be installed if the soil pipe itself isn’t vented e.g. can’t run up and out of the roof or external wall as it normally would do. Color Variants: For aesthetic or coding purposes, these valves come in different colours to match or identify different plumbing systems. Solvent Weld Waste systems, manufactured in modified PVCu are extremely durable and designed to provide secure solvent weld jointing. PVC-C provides superior fire performance and its high softening point means it is not adversely affected by very hot water discharges over long periods. Screw on Fixing: With the screw-type fixing, the coupling supplied with the AAV will have a thread within it and on the base of the AAV itself will be a thread. Simply fit the coupling to the top of the vertical pipe and then screw the valve down into the coupling until it is tightOnce you have found the ideal install location the next task is to cut the existing waste pipe so that you can fit a T-piece or equal-T as it’s known to run the vertical pipe to fit your AAV.

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