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Kapiti Coast District Council had one alloy flap gate in stock so it was originally installed for this project. But once installed and commissioned they found it did not seal against back pressure and still had some flooding upstream from the outlet. The council decided to replace with the Wastop as they have found in the past they could seal completely against back pressure while operating under low head pressure.

The installation took less than 2 hours because this was just a matter of changing one for the other

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