Manual pump to suck air bubbles out of tap? plumbing advice

Manual pump to suck air bubbles out of tap? Having airlock problems with our hot tap: when is is running we hear bubbling and sometimes it stops completely. We can get it running again by running the cold tap fast at the same time. We are not on the mains. Our plumber used a wet and dry vacuum cleaner to pull water through once, is there a less expensive device I can use to get the air out? Thanks...

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