With a rat population counted in the millions and constantly reproducing at a staggering rate, it is only a matter of time before they pay you a visit. So it’s up to you, leave the door open or close it… the choice is yours.
Most homeowners never think about what’s happening inside their drains—until it’s too late. Rats don’t need an open door, a crack in the wall, or a broken vent; they follow the pipes, using your drainage system as a direct path into your home. Traditional solutions either fail over time or block access when maintenance is needed. What’s needed is a simple, reliable and long-lasting way to stop them at the point of entry—without compromising your plumbing system. Learn how the Rat-Proof Flap OUT helps stop them where it matters most.
Designed to block one of the most common hidden entry points, the Rat-Proof Flap OUT installs inside compatible valves to create a durable stainless steel barrier where rats enter.
Order and enjoy free standard delivery. Or choose fast delivery via Express Post for $21.45.
Reliable rat protection that installs in minutes and delivers lasting real results.
A simple, complete approach with proven effectiveness and outstanding value.
Made of stainless steel for exceptional long-term durability and extended service life.
Use in Canada
This device is intended for installation only on plumbing systems that comply with the National Plumbing Code of Canada, as well as all applicable provincial and municipal regulations.
The installation of the Rat-Proof Flap OUT as a replacement flap within an existing backwater valve must comply with all requirements applicable to the building, the branch drain, and the valve type, as interpreted by the authority having jurisdiction (inspector, municipality, province or territory).
The user is responsible for verifying, prior to installation, that this type of device and configuration is permitted by local authorities, and that any required qualified professional performs the work.
Rat-Proof Flap OUT and the logic of the National Plumbing Code
The Rat-Proof Flap OUT is designed to integrate directly within an existing backwater valve, without modifying the piping or introducing a device not предусмотрed by the system. It operates by replacing the internal flap of a valve that already complies with the National Plumbing Code.
The Rat-Proof Flap OUT preserves the original geometry, diameter, and flow capacity required for sanitary drainage, while adding an effective mechanical barrier against rats. The valve body and its installation therefore remain compliant with code requirements, including accessibility for inspection and maintenance, while the original backflow prevention function is retained.
For homeowners and plumbing professionals, this approach follows the logic of the code: rather than replacing an approved valve with a non-certified device, an existing approved component is enhanced to provide additional protection.
Made from stainless steel, it is designed for long-term use in drainage systems, combining durability with a practical installation approach.
Made in Canada
Canadian Patent No. 3071004
The Rat-Proof Flap OUT is a mechanical rodent protection device installed within drainage and sewer systems to help prevent the entry and movement of rats and other rodents into buildings. It is designed to operate without the use of chemical substances or rodenticides, providing long-term protection against rodent intrusion in pipes ranging from 2 to 6 inches in diameter.
This product meets applicable safety and performance requirements for infrastructure protection and rodent control, and is aligned with current health, safety, and environmental standards in Canada and the United States. The user is responsible for ensuring installation is carried out in accordance with the manufacturer’s instructions, applicable plumbing codes, and all local regulations.
This product is a rodent protection device and is not a certified backflow prevention device.
The reality is simple: if your drains are not properly protected, your home is exposed. The most effective way to stop rats is to block them where they enter—before they ever reach your living space.
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