Flojet® automatic light duty water booster with 1.1 gal (4.1 liter) stainless steel accumulator tank, built-in inlet strainer, pressure switch, and check valve. It is designed to provide constant water pressure of 0 to 40 PSI, and maximum 4.5 GPM flow rate. Typically used where available water pressure is very low and fluctuates widely. The accumulator tank's butyl bladder is replaceable. This 115V system can be mounted vertically or horizontally.