New post A short video installing one of our 110mm non return valve rat flaps for use in sewers. These valves protect sewers against rats entering your property. This valve was installed at a school in Swindon rats had chewed through the chamber and had entered the school via rat holes into the foundation of the building.

If you have a rat problem please contact us and we would be happy to help, if you would like to purchase a non return valve please visit