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Which Problem are you solving?

Why Choose Green Monster

  • Professional Grade

    Product designed for long term protection and performance.

  • Trusted by Experts

    Used by Pest Control proffesional and facilitied managers nationwide.

  • Competetive Pricing

    High Quality Solutions Without the High price tag.

  • Fast UK Delivery

    Quick dispatch reliable delivery you can count on.

Testimonials

What the pros say

Would highly recommend Green Monster.....
Great product!
Top service every order!!

Mark Dixon
Cimex UK

Bought my second batch of these flaps recently. They are brilliant value for money and most importantly, have fitted in pipe work where other well known brands have failed ! thanks guys these are now my go 2 flaps!

Drain Services Ltd

Fitted 2 of these last week, Very impressed with this product tried many others. This rat stopper is Well made, easy to fit and Very reasonably priced. Thanks Green Monster uk

Joe Brake

I have used almost every type of drain valve on the market and can say with conviction, that the Green Monster UK Limited drain valves are some of the very best I have ever fitted, they offer superb build quality and ease of installation, these are now my go to valves.

Scott Mays
Wiltshire Pest Services Ltd

Brilliant product would recommend..Good delivery service as well.

Mark Jackson

used a rat flap from this company, and was very impressed with the quality of this product, it was easy to install too!
would highly recommend this company.

Ernest Feld

Frequently asked questions

What size valve do I need?

We offer 110mm (4") and 150mm (6") diameters. Measure your outflow pipework, or check your inspection chamber, and choose the matching size.

Can I fit it myself?

Yes. The valve fits at ground level into an accessible inspection chamber in a few minutes. For deeper chambers, our 1 metre installation pole (sold separately) makes it easy.

What pipework is it compatible with?

The valve suits all common drainage pipework including PVC, clay and cast iron.

Will it restrict water flow?

No. The curved flap opens to allow free flow of water and waste, then shuts once flow stops — keeping rats out without blocking your drains.

Is it suitable for shared drainage?

Fitting into the main outflow branch protects all branches, but on shared systems this may be against local water authority rules. The safest option is to fit the valve into your own outgoing branch only.