Simple but effective

Having tried almost everything to eliminate a persistent air lock in a gravity fed hot water supply to a remote bathroom basin I sorted it in a jiffy by doing this:
I put my thumb over the mixer tap spout turned, on the hot using the lift lever then slowly swung the lever to bring the mains fed cold into play. The pressure from the cold easily pushed back along the hot feed and shifted the air lock in a matter of seconds. Job done.

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