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mobile7 (Platinum member) > albums > H.V.A.C.--->Boilers
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The two valve handles are visible in this picture. To service the tank you turn off the left hand valve to isolate the tank from the system. Then you take a short hose and connect it to the right hand valve after removing the cap. The right hand valve is opened to drain the tank. Now the pressure on the tank can be checked with a tire gage and the air topped up.
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