Roshield Rat Drain Guard, 4 in / 110 mm Stainless Steel

Stainless Steel: Roshield Rat Drain Guard is a one-way flap intended to deter rats moving upstream through a compatible drain while allowing liquid and solid waste to pass. The listing specifies a 4 in / 110 mm version and says it can also fit 100 mm Victorian drains.

At a glance

One-way flap is designed to let liquid and solid waste flow downstream while blocking rats moving upstream.
Listing specifies 316 stainless steel and says the unit is made in the UK.
The bolt can be switched to suit flow direction, and installation is described for either the pipe entrance or exit.
Instructions are included, with support video and technical help available on request.

Price

£36.54Save 15%

Reference price: ~~£42.99~~

Price checked: 12 Nov 2026

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Often bought together

Roshield Rat Drain Guard | Stop Rats within Drainage & Properties | Rodent Flap Control & Prevention Proofing (Stainless Steel 6"/150mm)

£59.99

Pros and cons

Pros

Addresses rat access through drainage rather than general indoor pest control.
The stated 4 in / 110 mm size is also described as fitting 100 mm Victorian drains.
No batteries are required.

Technical specifications

10 specifications

Product details
Brand	Roshield
Manufacturer reference	RDG1
Size	4" / 110mm
Material	316 stainless steel (marine-grade)
Package dimensions and weight	11.2 x 11.1 x 8.9 cm; 450 g
Specific use	Prevents rats from gaining access to properties via drainage systems
Batteries required	No

Installation and operation
Flow direction	The included bolt can be switched to match the flow direction.
Installation position	Drain guards can be installed either at the entrance or exit of the pipe.
Compatible drain note	The drain guard can be installed into 100mm Victorian drains.

What to know before buying

Listing details to confirm

The listing gives the 4 in / 110 mm size but also says it fits 100 mm Victorian drains. Confirm the pipe and installation position are compatible before purchase. Installation and maintenance ease are described inconsistently: one section says no tools are required, while another mentions an included bolt and switching it to match flow, and maintenance claims range from no long-term maintenance to maintenance-free. Customer feedback is also mixed on waste clearing, including one report of waste getting stuck at the back.

Who is it for?

A good fit for

Property owners seeking a drain-mounted barrier against rats entering through a compatible drainage system.
Buyers who can verify their pipe size and flow direction before fitting.

Less suited to

Those seeking a general-purpose rodent barrier for walls, roofs or indoor spaces.
Buyers unable to confirm that the stated size fits their drain.

Roshield Rat Drain Guard, 4 in / 110 mm Stainless Steel · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 359 ratings

5 stars64%64%
4 stars17%17%
3 stars12%12%
2 stars2%2%
1 star5%5%

Customer feedback highlights perceived effectiveness, sturdy construction, a tight fit and straightforward installation. Price opinions are mixed, and reports about waste clearing differ, which matters because the flap sits in the drainage path. Confirm the fit for the intended pipe and consider the reported possibility of waste catching before choosing it for a system where reliable waste flow is a priority.

Positive themes

Customers report effective rat prevention and a sturdy fit.
Installation is described positively, including one report of completing it in under five minutes.

Negative themes

Some customers consider the guard expensive.
One customer reports waste getting stuck at the back.

Mixed feedback

Feedback on cleaning and waste flow differs, with one customer reporting no toilet-paper blockages and another describing waste catching.

Frequently asked questions

What drain size is this guard listed for?

The listing identifies the version as 4 in / 110 mm and says it can also be installed in 100 mm Victorian drains. Check the drain dimensions and fit before buying.

How does the flap work?

The one-way flap is intended to let liquid and solid waste move down the system while preventing rats from moving upstream.

Can the guard be fitted in either direction?

The listing says it can be installed at the pipe entrance or exit, and that its bolt can be switched to match the flow direction.

What do customers report about waste passing through?

Feedback is mixed: one customer reported no blockage with toilet paper, while another mentioned waste getting stuck at the back.