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  • Multi Flap MF3 rat barrier Multi Flap MF3 rat barrier

Multi-Flap MF3 Rat Barrier- Non Return Valve (DRAINS)

Quick Overview

Budget barrier but very effective
£21.96 Incl. VAT
How much will this cost to deliver?


  • Budget drain barrier
  • Stops rats entering
  • Simple to fit

Please note this unit is NOT suitable for an outlet pipe into manhole, it will only be suitable for the pipe that exits manhole to sewer, therefore you need to locate last chamber before sewer.
How does it the mf3 work?
This unit fits into the chanel exit in an inspection chamber to stop back flow or rats entering your drainage system.
The MultiFlap is a one-way non-return valve that fits easily to the exit pipe from your house to the street sewer. This means waste still goes out from your house, but immediately after the waste water has gone, the flap closes to prevent anything nasty coming up the wrong way. The prevention method and the ease with which the MultiFlap can be installed makes these products truly unique.
How can vermin get into my drains?
Since the 1950's drainage systems have been much less isolated from the main street sewer and this has allowed rats more access into peoples drainage systems. Damaged or unmaintained storm drains and sewer pipes easily allow vermin access into the main drainage systems. From here they can enter your home by travelling through sewers, up pipes and exiting from the foul air outlet at roof level or swimming through the water contained in your toilet system. The MultiFlap ensures you’re protected by keeping them in the sewers where the authorities can deal with them.
Brilliant new device to stop rats gaining access into your drainage system.
Please note; this model is made of a high grade plastic, but a determined rat can, and will, chew through plastic. Although this is very rare, it is possible. If this this concerns you, you might like to consider a more expensive stainless steel model (see below in associated products).
There are diffent models for toilets and drains, the model for toilets is above this one on the page.
Please find full fitting information in DATA SHEETS tab.

Feefo Reviews - Average 100% (31 reviews)

Date Score Customer Comment Our Response
10-Nov-2017 Product:

Excalty the product I needed.
05-Feb-2017 Product:

Excellent product and fast delivery.
24-Nov-2016 Product:

06-Sep-2016 Product:

Really easy to fit
Stopped the problem
Perfect :)
23-Jul-2016 Product:

24-Mar-2016 Product:

Easy to fit.
23-Mar-2016 Product:

looks good, can't comment on longevity.
23-Mar-2016 Product:

As a quick fix that is cheaper and easier to fit than the steel version these are good, but 2 previous ones purchased did have holes chewed into them over a period of several months and are then useless, if the flap were metal it would be better. You have to keep checking them to see if they are... Read More.
20-Mar-2016 Product:

Easy to install and have had no problems as of writing this.
11-Mar-2016 Product:

The product did what it said it did
18-Feb-2016 Product:

works well easy to fit
14-Feb-2016 Product:

31-Dec-2015 Product:

Product seems to do what is intended so far.
26-Nov-2015 Product:

05-Oct-2015 Product:

Far too expensive for the quality. I would use dozens of these at £15 and they cant cost more than a couple of quid at the factory gate.
14-Jul-2015 Product:

Simple to fit
19-Jun-2015 Product:

19-Apr-2015 Product:

It looks good, easy to fit. Only time will tell if it really works!!!! It should.
05-Apr-2015 Product:

Decent product for the money, though they perish over time and need replacing.
27-Feb-2015 Product:

Read more reviews on Feefo