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anywhere I would suggest that you use a small needle valve instead of a bolt. I say this because over the years a bolt will just get loose and cause you problems. I had the same issue with my air conditioner. Every time I start it after sailing in any kind of a sea I need to vent the air that's picked up. I just start the AC and open the valve for a second or two. The valve has a small hose to direct any water into the bilge while I;m bleeding the system.