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Deleted member 126969
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As @CaptainChaos says, try squirting some lubricant in the ‘pinhole’ where the spigot on the flap goes, exercising the catch and see if that helps. Only issue I’ve had with ours was when it froze once shut once. I used a PTFE based product, GT86, and only had to do it once. Since then, it’s never been a problem during cold weather here, although we don’t get it as cold as you do!