Rat Blockers Stainless Steel Drain Rat Flap, Twin Valves

Rat Blockers’ stainless steel drain rat flap is designed to fit 4-inch clay or plastic drains and uses twin non-return valves to allow waste flow while blocking rodent entry. Its shorter design is described as suitable for curved fittings, but confirm the required size before purchase because the listing gives conflicting dimensions.

At a glance

Twin valves are described as allowing waste flow while obstructing rats attempting to enter from the drain.
The listing claims compatibility with 4-inch clay and plastic-type pipes.
Stainless steel construction is described as rust and gnaw resistant.

Price

£55.99Save 20%

Reference price: ~~£69.99~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

Twin non-return valves provide a two-valve barrier while allowing waste flow, according to the listing.
The claimed compatibility with both clay and plastic-type 4-inch pipes may suit different existing drainage materials.
The shorter design is specifically described for curved fittings.

Technical specifications

10 specifications

Identity
Brand	Rat Blockers

Design and fit
Material	Stainless steel
Valve design	Twin non-return valves
Drain compatibility	4″ size
Drain material compatibility	clay and plastic-type pipes
Design detail	Shorter Design for Curved Fittings
Title size description	4 inch Rat Flap(95mm/105mm)
Product description size	Stainless Steel Rat Blocker for Drains Twin Steel Valves, 4 inch Rat Flap(100mm/110mm)

Other details
Package dimensions	14.6 x 12.4 x 12 cm; 560 g
Manufacturer's warranty claim	15 MONTHS MANUFACTURE'S WARRANTY

What to know before buying

Listing details to confirm

The listing gives conflicting flap dimensions: the title says 95mm/105mm, while the product description says 100mm/110mm. Confirm the size and fit for your drain and curved fitting before ordering. Rust resistance, gnaw resistance, rat blocking and the 15-month manufacturer's warranty are listing claims, not independently verified here.

Who is it for?

A good fit for

Buyers seeking a stainless steel drain rat flap with twin valves for a compatible 4-inch clay or plastic pipe.
Installations where a shorter drain blocker is needed for a curved fitting, subject to checking dimensions.

Less suited to

Buyers who need a confirmed fit for a specific pipe measurement without first resolving the listing's inconsistent dimensions.

Rat Blockers Stainless Steel Drain Rat Flap, Twin Valves · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 22 ratings

5 stars59%59%
4 stars24%24%
3 stars17%17%
2 stars0%0%
1 star0%0%

Aggregate customer ratings are mostly positive, with a substantial middle group of three-star ratings as well. That offers a cautiously favourable signal, but ratings alone do not explain customer experiences or establish how well the flap fits a particular drain. The stated size discrepancy makes checking compatibility especially important.

Frequently asked questions

What pipe sizes does this rat flap fit?

The listing describes it for 4-inch pipes, but gives two different flap dimension pairs: 95mm/105mm in the title and 100mm/110mm in the product description. Check the required measurement before buying.

Can it be used with clay and plastic drains?

The listing claims compatibility with both clay and plastic-type pipes in 4-inch size. Confirm the dimensions and fitting style against your drain.

How do the valves work?

The listing says the twin non-return valves allow waste flow while blocking rodents attempting to enter from the drain.

Is a warranty stated?

The listing claims a 15-month manufacturer's warranty. Check the selected listing for its applicable terms.