Robust, corrosion-resistant rat blocker that offers a a clean, non-toxic long-lasting pest control solution. Manufactured from stainless steel. Can be installed by hand or from street level. Suitable for domestic use in plastic, clay and cast iron drains. Features an external hinge that enables maximum waste flow. Untreated Steel Construction For use Against Rodents Suitable Pipe Diameter: 100mm Suitable for Plastic, Clay, Concrete & Cast Iron Pipes Suitable for Domestic Use Single Flap Corrosion-Resistant Untreated Steel Construction For use Against Rodents Suitable Pipe Diameter: 100mm Suitable for Plastic, Clay, Concrete & Cast Iron Pipes Suitable for Domestic Use Single Flap Corrosion-Resistant