Underground Drainage Back Flow Rodent Barriers Flap Valve 160mm With Stainless Steel Flap Dek-drain-non-return-valves-product-data Dek-Drain Flap Valves are located on outfalls to reduce the risk of back-flow up pipework installations and subsequent flooding. In addition to the products’ ability to prevent water backflow they are also effective rodent barriers.
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