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Airhead
We have a drain cover near a window that can smell somewhat... is there a sprung valve/cover/seal thing that could be opened by the weight of rain water and then close up automatically to prevent smells getting out?
I've seen stuff like this
https://www.ecoprod.co.uk/green-drain-waterless-trap-seal-for-floor-drains/
But not sure if they're any good, or if there's just a go to search term I should be using to get something from screwfix or similar