Sewerstore Purchase Our Rat barrier Drain Flap Here!

Sewerstore are manufacturers of non return valves our valves act as a drain flap to keep rats out of your house or business. Our valves are made using marine grade stainless steel ensuring durability within a extreme environment.

If you would like more information please contact us

If you are unsure which valve you require please contact us using the link provided. We are able to advise which drain flap you require please send us a picture if you would like us to confirm if the valve will fit your sewer.

Why use our drain flap for rat prevention?

Our drain flap non return valve is made using fully marine grade stainless steel which is designed to be long lasting in extreme environments.

Other Reasons to use our non return valves?

Designed for harsh environments

Fully stainless design

316 grade internal stainless hinge

Made in the United Kingdom

Prevents Rats Accessing Homes via sewer pipes

One way flap allows waste out and prevents rats getting back in.


Please find below some images of our drain flaps installed in sewers protecting customer against rat infestation.

5.0 rating
5 out of 5 stars (based on 5 reviews)
Very good0%

Great product

5.0 rating
31st January 2019

Great product glad the rat flap solved our rat issue.

Gary Oliver

Great valves

5.0 rating
29th November 2018

We only use these valves.
They are good quality and value

Darren lee

Rat flap

5.0 rating
14th November 2018

Looked online at several options. This seemed good value plus made of stainless steel. After fitting no more visitors job done.

Alastair Olver

Great Product

5.0 rating
18th July 2018

Thank you a great product and quick dealivery



5.0 rating
22nd March 2018

I have to say I was sceptical about these valves but after installing it they work perfectly and have solved our rat problem. Great Stuff

Jim in London

Response from Sewerstore 110mm Non Return Valve For Protection Against Rats And Flooding

Thank you for your review

Contact Us If You Require Advice!

We are more than happy to advise on which valve is best for you all we require is a photo of you sewer outlet and we can point you in the right direction. Please use the contact form on our contact page.