Maintaining an air supply in a pressure tank is necessary for the tank to provide pressure. If the pressure tank is equipped with an absorption barrier float, there may be so little air absorbed that adding a little air with a hand pump every 9 to 12 months is all that will be needed.
However, if no air-absorption barrier is in place, an air-volume control will be needed. The control is used to keep the proper amount of air in the tank in relation to the amount of water. Different designs exist to match different pump types:
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