110/160mm NRV - Sale

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Price: Β£90.00

A 160mm/110mm non-return valve, adaptable for either pipe size via flexible collars. 

β€’ RRP new is Β£296.80 plus VAT! Only 3 available!

β€’ Installed underground in the correctly identified position

β€’ Accessible manhole chamber for maintenance

β€’ Defends against the backflow of sewage & flood water into the property

This item is from old stock. It's unused & functions as new, but past the original manufacturers (Flood Angel) warranty period. Therefore, no product warranty is available with this item, & there is no return option for sale items of old stock.

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  • Details
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β€’ Size: Height 260mm  -  Width 330mm  -  Length 660mm 

β€’ Weight: 5kg

β€’ Tested to PAS 1188-1:2019. Fulfils EU standards 13564-1: 2002.

β€’ Can be installed to the main drain pipework, or a branch selection to the toilet.

β€’ Suitable for foul or clean water, domestic or commercial

β€’ Made from acrylonitrile butadiene styrene (ABS), polycarbonate, stainless steel, silicone seals & polyethylene. 

β€’ Allows one-way free flow when open, passively closing when backflow emerges.

Make a saving of Β£206.80 plus VAT on this unused item.

The underground 110/160mm NRV can require a more advanced installation. Therefore the user must be a very competent DIY'er, & at least have some experience in ground & pipe works. The below is advice only. More information can also be found in the installation guides:

A good first step is to first assess the depth of the pipe underground. You can do this by lifting the nearest manhole chamber lid. The inlet feeds will indicate the depth below ground level. 

If you have a relatively shallow pipe, this will aide installation & reduce risk. However, if you're pipe is deeper than expected, contact a professional - or consider a 110 Pushfit or Toilet Bung.

Step 1: Locate the position for where you will house your NRV. This will be somewhere between your property exterior wall (usually close to the downstairs toilet), & your exterior manhole chamber. Mostly, this is a straight line. If there is not enough space available, you can consider the 110 Pushfit NRV or a Toiler Bung. We strongly advise using the necessary equipment to locate any pipes, mains or feeds beneath the area you intent to dig before beginning.

Step 2: Once you have taken the necessary steps to allow safe excavation, mark the area to be dug. This will be larger than your NRV, as well as allowing for space to cut & connect to the underground pipe.

Assess the type of ground you will be removing, & consider the future reinstatement (such as gravel, slabs or paving).

Step 3: Neatly excavate your top layer, taking care to cut along joints if removing patio or similar. Then continue to carefully remove earth & sub-base debris, taking care to note any pipes or obstructions along the way. Continue until you expose the pipe. Place debris to the side as some of this can be refilled.

Step 4: At this stage, ensure no-one uses the toilet as you will be cutting the pipe. You may need to dig around the pipe some more so you can safely get your cutting tool of choice around the pipe. Mark the area to be cut, taking into account any reducers or joints required. Then cut your pipe in a straight line, taking extra care with clay pipes as these can chip easily. Use PPE.

Step 5: Fit your NRV, including any reducers and joints, utilising & tightening any jubilee clips required. Be sure to place facing the correct way, else you will cause an ugly blockage. You can then test the flow and seal by flushing the toilet a couple of times, & even pouring extra water down the toilet to increase flow. Address any seepage.

Step 6: Back fill the bottom of the pipe with pea gravel until the pipe only is covered, leaving the top of the inspection chamber clear. 

Step 7: Install your risers onto your NRV all the way to the top of to-be-finished ground level. Then, using your manhole chamber of choice, trim the top riser down to the required height so you manhole chamber will sit flush with the ground level.

Step 8: Using your previously excavated earth, back-fill around the risers, compacting as your go to avoid future settlement. Fill right up to the level needed before you complete any required sub-base for your ground level finish.

Step 9: Complete the required sub-base, fit and place your manhole chamber in position, & reinstate your ground, providing a neat finish around your new manhole chamber. Once set, you can test removing the lid, and accessing the inspection chamber to practise maintenance of your underground NRV.

  • Do you provide an installation service?
    If you are within the Lincolnshire area, get in touch & we can provide you with a quotation for supply & installation. If you are outside this area, if you’re not a competent DIY’er, we recommend contacting a local tradesperson, or we can point you in the right direction (depending on location).
  • What is Property Level Protection (PLP)?
    Property Level Protection (PLP), which is also referred to as property level resilience, are measures that can be taken to reduce the impact of flooding. They can be categorised into the following two groups: – Flood resistance measures involve trying to stop the water entering the property in the first place. These can usually be fitted to the outside of a property to prevent or limit the flood water getting in and can include flood boards, air brick covers, non-return valves and pumps, as well as work to ensure that the fabric of the property is sound. Flood resilience is about reducing the damage to the inside of your property in the event water does enter and speeding up the time it takes to recover after a flood. Such measures that can be taken include using porous plaster, fitting solid floors or tiled floor coverings, raising electrics to preserve the electricity supply and taking simple steps in a flood event to move furniture and valuable possessions upstairs to lessen the damage flood water can cause.
  • Can You Fit Defence Products to Commercial or Listed Properties?
    To commerical properties yes, listed buildings or conservation areas - maybe. Conservation areas or listed buildings may have restrictions on what's allowed, and some compromises may be made on options available and their installation. This can include colour coding to match the buildings, dΓ©cor or installation reactive measures which are not visible until deployed. Commercial properties usually have more or larger openings that require defending, as well as a larger area. This usually costs more money, so we recommend, where possible, ways of limited damage if a flood occurs (such as raising electrics or stock).
  • Will Flood Defence Items spoil the look of my house?
    Some flood defence options have the option to not be visible (such as repointing, water resistance plaster and spray to reduce seeping through the walls). But most flood defence products will require some type of fixing or installation point, such as sump pumps or barriers.. If visibility is of great importance to you there are passive flood defences options such as flood doors and airbricks that look almost identical to a regular door but with defences in their structure and mechanisms. It is important to consider the primary function of flood measures - to stop flooding, with their aesthetic appeal being lower on the list of priorities.
  • Do My Flood Defence Products Need Maintenance?
    We recommend that as a minimum, any products should be inspected or serviced annually (with some products being tested). Also, following any flood event all products are thoroughly cleaned and inspected for damage.
  • What is Passive vs Reactive?
    These terms refer to whether you need to physically deploy your flood defence measure before a flood event. Passive items work automatically. These measures include: Flood Doors (when the handle is lifted); Anti-Flood Airbricks (closes a valve); Sump Pumps (float switch); & Non-Return Valves. Reactive measures refer to items that do not work automatically. These include items such as the Toiler Bung; Flood Defence Barriers & Puddle Pumps. Passive measures are typically better, but generally cost more than their reactive measure counterparts, so homeowners may have to find a balance of budget vs the item they use to defend their property.
  • Can I fit flood defence items myself?
    Yes you can, though some items are easier than others. Toilet bungs, some Non-Return Valves & FloodSax are quite easy for homeowners to deploy. Anti-flood airbricks, other Non-Return Valves are more difficult but still quite achievable for the competent DIY'er. Some defence measures do required a specialised & experienced tradesperson, such as Flood Defender Doors, Barriers & Sump Pumps.
  • Do the Flood Defence Items Guarantee my property from flooding?
    Installing Flood Defence Items does not guarantee your property from flooding, hence the terminology Defence or Mitigation. It is important to note though, that the items listed are tested to stringent requirements, with most complying to BSI Kitemark regulations. As such, they can protect their dedicated point of entry if installed correctly. Water may still find an entry through a different section, exceed the height of current protection, or partially breach the existing protection.

We strongly advise reading our Deliveries & Returns information, to fully understand the delivery of your item(s). 

To summarise, see below:

Order Processing:

Orders for Flood Defence Items placed before 12pm midday, are generally processed for dispatch the same day. Orders placed after midday will be processed next day. Orders placed on bank holidays or weekends will be processed the next working day. A member of our team will update you via the contact information provided.


After dispatch, your order will take approximately 2-3 days to be delivered. This may be longer for larger orders, or for items being delivered to the Isle of Wight, the Isle of Man, the Scottish Isles, parts of Scotland, Northern Ireland, the Channel Isles and a small number of restricted postcodes. Additional delivery costs may also apply depending on these locations & delivery items.

The delivery of your items will be carefully packaged, signed off, & will be delivered via a courtier network. We strongly advise being present for delivery to inspect your products & sign delivery notes.


Please be aware there are no returns and/or refunds available for items on sale which are from old stock & past the manufacturers warranty period.