Air Volume Control Kit, For Jet Pumps, Pressure Range 2060 PSI, Maximum Pressure 100 PSI, For use On Tanks With Capacity up to 220 Gallons, Suction Port Size 1/4" Compression, Tank Port Size 1/4" Male Iron Pipe Thread, An Air Volume Control Device May Be Installed On The Water Pressure Tank If It's An Older, Bladderless Steel Tank, Air Volume Control Is Intended To Automatically Put A Little Replacement Air Into The Tank From Time To Time As Water Pressure Cycles Up & Down Or Each Time That The Water Pump, Runs, Use With TV#'s 123354, 123335, 123336, 123333, 123337, 123353, 123355 & 123357.