Caleffi Pre-Adjustable Automatic Filling Valve 1/2" Inside Npt Inlet X 1/2" Outside Npt Outlet 553542A

The Caleffi 553542A Automatic Filling Valve features a 1/2" inside NPT inlet and 1/2" outside NPT outlet, designed to regulate system refill and pressure balance in HVAC loops. It is pre-adjustable for precise flow control.