BT20-40 Booster System gives you the ultimate performance in strong, even water pressure. The flow control starts the pump as soon as you switch on the tap and continues running until water is no longer required. This pump is great for boosting sprinklers for irrigation on residential systems or sprinkler stands. Because the Davey 1.5 HP 220V Electric Water Booster Pump uses a flow control, it requires a minimum of 20 PSI incoming pressure for the flow control to operate consistently. Adds 70 psi of boost pressure at 5 gallons per minute, 63 psi at 10 gpm, and 54 psi at 15 gpm flow rate. Max pump casing pressure not to exceed 115psi. Select specifications tab to view a full pump performance chart with the full range of pressures at the given flow rates for matching up to your sprinkler system capacity.