574156A Caleffi 574 AutoFill Combo 3/4" Press Inlet, 3/4" Press Outlet.

Pre-adjustable automatic filling valve with testable reduced pressure zone backflow preventer with air gap. Max. working pressure: 150 psi.
Max. working temperature: 140 °F. Pressure gauge scale: 0—100 psi.
Pressure setting range: 6-90 psi. Preset outlet pressure: 15 psi.