Caleffi 553642A AutoFill™ Automatic Fast-Filling Boiler Fill Valve, 1/2" NPT X 1/2" NPT w/ Pressure Gauge D620F1 Our Duct Slitter pierces and

Our Duct Slitter pierces and elongates a snip starter hole in sheet metal duct

Body Mount: Deck

Rugged bimetal switch action

12-20 AWG Stranded Screw Shearing: 6-32

Caleffi 553642A AutoFill™ Automatic Fast-Filling Boiler Fill Valve, 1/2" NPT X 1/2" NPT w/ Pressure Gauge D620F1 Our Duct Slitter pierces andCaleffi 553642A AutoFill Automatic Fast Filling Boiler Fill Valve, 1 2" NPT X 1 2" NPT w Pressure Gauge The CALEFFI AutoFill is unlike traditional boiler fill valves, AutoFill automatically and quickly fills the system to the preset pressure and shuts off. With the optional pressure gauge the system pressure can be viewed and adjusted as needed, no more guessing. The automatic filling valve is a device consisting of a pressure reducing valve with