Yes, add or remove water. Add to increase and remove to decrease.
Use the autofeed valve to do this. Lifting the lever allows city water pressure into the system. Lowering the lever puts it back to its limiting setting. Most auto feed valves have a pin under the cap that can be adjusted by screwing in the top or unscrewing the top. This adjusts the preset pressure. Never go over 25 pounds or you will discharge the pressure relief valve.
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