Non-Return Valves
Drain Rat Blockers and Rat Non-Return Valves
Drain rat blockers are designed to help stop rats entering a property through drainage pipes, sewer connections and inspection chambers. Browse the products below to find 100mm / 4 inch and 150mm / 6 inch drain rat blockers for suitable pipe sizes.
Rat Blockers for Drains
Rats can travel through drainage systems and may enter buildings through drains, waste pipes or damaged pipework. A drain rat blocker, also known as a rat non-return valve or rat flap, is fitted inside the drain pipe to allow normal flow while helping to prevent rats travelling back upstream.
These products are for drain and sewer pipe protection. For mesh, vent covers and other ways to block rodent entry points, see our rodent proofing products.
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Mastertrap Drain Rat Blocker Single Flap 4" / 100mm
£69.99Rats use drainage systems to move between properties and access buildings through toilet connections, floor drains, and wastewater pipes. This single-flap valve installs inside 4-inch (100mm) diameter drains to block that route permanently while...£69.99 -
Mastertrap Drain Rat Blocker Single Flap 6" / 150mm
£114.99Larger drainage pipes in commercial properties and main waste lines require proportionally sized protection. This 6-inch (150mm) single-flap valve installs inside commercial-grade drainage systems to block rat access while maintaining full water flow and...£114.99 -
Retrofit Water and Rodent Non-Return Valve 110mm / 4 inch
£99.99Non Return Valves - Retrofit Water & Rodent NRV 110mm/4 inchNon-return valves allow sewer or surface water materials to freely flow in the direction of the systems mains but block backflow of those materials in the opposite direction in instances,...£99.99 -
Retrofit Water and Rodent Non-Return Valve 150mm / 6 inch
£139.99Non Return Valves - Retrofit Water & Rodent NRV 150mm / 6 inchNon-return valves allow sewer or surface water materials to freely flow in the direction of the systems mains but block backflow of those materials in the opposite direction in instances,...£139.99