Ratflap - Rat Drain Blocker

Buy The Ratflap - Drain  Non-return Valve for Rats

- Ratflap - Rat Valve - Rat Blocker - Rat Stopper - Rat Flap -

ratflap overview

If you hear rats in the walls, ceilings, or attic of your home, they most likely come from the sewer underneath the house. The best way to control rats on the long term is to fit a Ratflap Sewer non-return valve to your drains pipes.


What is the Ratflap?

The Ratflap is an ideal solution against rats entering properties via the drain system. The non-return valve is simply pushed into the pipework and does not require any specialist expertise or fitting equipment.

ratflap overview 1  ratflap drain rat blocker 4 inch pipe

Once fitted, the chemical resistant stainless steel valve let rats leave your property but they cannot get access back.

The Ratflap has been invented and patented by an Irish pest controller, and is now sold worldwide. Ratflaps are manufactured from high quality acid resistant 304 grade stainless steel. The smooth design provides no resistance to the flow of waste. It is the only rat blocker system that allows 98.5% of the volume of the pipe to be utilised for waste flow .


Benefits of the Ratflap

The Ratflap provides these unique advantages:

  1. An immediate solution to rat infestations under floor boards, in walls or attic, as rats do return to the sewer for getting food (usually every day).
  2. Eliminating the expenses or delays of investigative work, e.g.: drain CCTV surveys, lifting floor boards, removing plasterboards, etc.
  3. Prevent the dilemma of killing rats by poisoning, which can leave dead bodies in the building structure and terrible smells that go on for weeks.

ratflap blocking rats


WHERE to Fit a Ratflap?

If you have several toilets in your house you may have a few drain pipes converging onto a main one. If possible, locate the LAST manhole / inspection chamber on the sewer that services your property. This way you will only need one Ratflap only instead of one in each manhole.

These are the main scenarios:

  • Detached house: Usually only one Ratflap needs to be installed:

 ratflap rat blocker sewer installation detached house


  • Semi-detached houses: Two Ratflaps are usually needed (one for each half of the building):

ratflap rat blocker sewer installation semi detached houses


  • Terraced housesEach house of the block usually need one Ratflap:

ratflap rat blocker sewer installation terraced houses 


  • Apartment block: As many drain pipes come out of the building (sometimes over a hundred), the most cost effective way is to use tracing dye and drow a map of the waste water flow. As little as one 9" Ratflap may be sufficient if the main manhole (at the start of the line) can be identified.

ratflap rat blocker sewer installation apartment block


HOW to Fit a Ratflap?

Check the Ratflap

manufacturer installation guide Here:
user guide manual installation s

Please note: Thanks to a recent improvement in design the wire is no longer needed for standard Ratflaps and manufacturer do not include it anymore. Wire is only included and needed for the Ratflaps with a welded nut (for installation with an extension pole) Please contact us for more details.

If you would like your Ratflap(s) to be professionally installed for you, contact us on 014523680.


Buy a Ratflap - What size do I need?

ratflap sizes 4 5 6 9 inch

The Ratflaps come in 3 sizes for the common diameter drains: 4 inches (102mm), 6 inches (152mm) and 9 inches (229mm). You will need to measure the diameter of your own drain. Some old clay pipes are 5 inches (127mm) in diameter.

4" Ratflap €124.00 (VAT23% extra)

5" Ratflap €335.00 (VAT23% extra) - non standard item

6" Ratflap €162.00 (VAT23% extra)

9" Ratflap €335.00 (VAT23% extra) - non standard item

Select Ratflap Size:


Due to the unhealthy nature of any sewer, the Ratflap cannot be returned to us after it has been installed.

Before attempting to install the unit be sure you have ordered the correct size for your pipe system. You can only return for a full refund or size exchange if the Ratflap has not been inserted into a sewer.

Bulk Orders & Enquiries: please Contact our Trade Counter on 014523680 (ext.2).

fast delivery

Order before 2pm for Next Day* Delivery Ireland and Northern Ireland (for stocked items) €4.50 +VAT.

We only deliver to Ireland and United Kingdom (England, Scotland, Wales, and Northern Ireland).







Check our Full Catalogue in PDF:

Owl Pest Control Products Supplies Ireland catalogue 2019

(*) Check our Terms & Conditions Here

Professional insecticides and rodenticides are for qualified pest control trade only. We are unable to supply members of the public with restricted rodenticides & insecticides. Training Diploma, Trade Association membership, etc. must be provided.

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About Us

  • Protecting Homes and Businesses from pests since 1998.
  • Commercial and Residential Pest Control in Dublin and Leinster.
  • Affordable and effective service by local technical experts.
  • Online Pest Control Supplies. 

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