In line Back Flow Prevention Non Return Valve 110mm, 160mm, 200mm
Freeflush
£59
Price read from Freeflush on 2026-10-15. Check before buying.
Please note there are two versions of this valve, this is the outlet flap valve suitable for placing onto the end of plain ended pipe. The Outlet flap valve version can be found here . Inline Enclosed Back Flow Prevention Non Return Valve Backflow Prevention Valves (non-return valves) effectively secure any rooms located on the lower floors against flooding caused by back flow of storm water and sewage. Back flow may be caused by intense rain, thaw or floods. BS8515 recommends the use of backflow prevention valves for underground rainwater systems to prevent sewage entering the rainwater tank.
Freeflush's own words, read from their page.
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