Rat Blocker Rat Flap 90mm – 98mm Non Return Valve


Title Range Discount
Sewerstore Bulk Discount 0 - 2 0%
Sewerstore Bulk Discount 3 - 6 5%
Sewerstore Bulk Discount 6 - 10 7%
Sewerstore Bulk Discount 11 - 15 10%
Sewerstore Bulk Discount 16 - 20 13%
Sewerstore Bulk Discount 21 + 16%


This is the smaller version of the 4-inch model it is used in sewers that have been repaired using a drain liner or insert or using a smaller pipe it is ideal for 90mm – 98mm pipes. It is compact and provides the same protection as all our other rat flaps.

This is our new updated version of the Ratbarrier Non Return Valve Rat-Flap, these are built in house by us using 316 Grade Stainless Steel. The valve does not come with the nut and bolt this is for deep chamber installation and can be purchased from us if required please see our other items. The valve is push fit in design and in a chamber which is not deep you can simply compress the valve body and insert it into the outlet and it will clamp to the inside of the chamber (No fitting kit is required).

We are pleased to announce the availability of our new fitting kits for installing our valves at depth.

Fitting kit for our valves now available you will need to order a optional fitting kit and a pole, with this to fit the RB2 RB4MINI and RB6 and Mini Valve but not the micro valve.

For example if you purchase 1x RB4 valve and wish to install using our 1m pole you would require 1x RB4 1x 1m Pole and 1x fitting kit

Another example would be you would like to install 4x RB4 and you require 1x pole the purchase 4x RB4 4x fitting kit and 1x 1m pole

To save on postage costs and passing this on to customers our poles are cut in half and supplied with a connector nut.

Please not we cannot guarantee that our poles or fitting kits will fit other manufacturers valves and this pole is designed to fit the Sewerstoreratbarrier and advanced metal works valves.

Our Rat Blockers are built to order and are produced using our plasma cutting machines.

Common Questions Asked By Our Customers
Are these tried and tested? Yes we are a pest control company and install these valves ourselves, the valves are made by pest controllers for pest control.
Why are your less expensive than other products? Most other suppliers purchase from either china or from laser production companies. We have always prefered to build in house and supply direct to trade and consumers.
What Grade Steel Do You Use? We use 316 Grade stainless steel which has the best corrosion resistant properties compared to the common 304 grade used in other Valves.
What sizes do you offer? We offer 4″ and 6″ valves, this listing is for the 4″ version which fits 100mm – 110mm pipes. It will fit all pipe types including ceramic, clay and plastic.
What comes with the valves? All valves come with a retaining cable for easy removal and safety purposes, it is normally secured on the lid or the chamber wall.
Do you offer discounts for bulk orders? Yes we are happy to provide discounts for bulk orders please message us to discuss this.
If you have any questions please let us know.


There are no reviews yet

Be the first to review “Rat Blocker Rat Flap 90mm – 98mm Non Return Valve”

Your email address will not be published. Required fields are marked *

Independently verified
9 reviews