FEED WATER PRESSURE REGULATORS - These regulators must be installed in the cold water supply line to the boiler and in horizontal or vertical position Regulator is set to feed water at approximately 15 lbs pressure. These regulators have a strainer screen ; FAST FILL and PURGE LEVER- These valves are equipped with a unique and simple ''fast fill and purge lever''. This permits rapid filling of the system, and sustained flow for air purging. When the purge lever is raised to the vertical position, it presses the ''push'' rod down which manually forces the valve wide open for maximum flow. Returning the lever to its normal position releases the tension on the rod permitting the valve to maintain normal pressure in the system automatically ; Watts 1156F Series feature highest capacity performance (twice that of contemporary popular competitive makes) as well as unique simplified servicing accessibility for complete unitized maintenance. Maximum temperature: 212° F. Maximum pressure: 100 PSI. Adjustment range: 10-25 lbs. Set at 15 PSI.