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Course you see why there's a need to leave the tap open. Your leak.Don’t see why there is a need to leave the tap open. Air is compressible and water is not. A double check valve isn’ listed as necessary for an ou5side tap although I suppose there would be no disadvantage.
However, to get back to my question, what should I do to prevent this happening next winter?
Water regs require an internal double check valve on new installations.
Go on admit it, you did it yourself.