Emergency Back Up Sump Pump, Operated By The Pressure Of Your Municipal Water Supply, No Electricity Required, The Water Under Pressure Will Flow Trough The Pump Jet Which Creates A Suction & Cause The Water In The Sump To Be Drawn Out Into The Discharge Line In Case Of Power Failure Or Primary Pump Failure, Made From Brass For Longevity, Essential To Complete Any Type Of Conventional Sump Pump, The Municipal Water Supply Have To Be At A Minimum Of 20 PSI At The Valve During The Operation Of The Pump When Water Is Flowing Through The Pump & The Maximum Static Pressure Is 70 PSI When The Pumping Operation Is Completed, Operating Valve Includes A Built-In Backflow Preventer To Protect The Municipal Water Supply Line From Any Contamination, Capacity 1200 GPH At 5', 950 GPH At 10' 600 GPG At 15'.