3/8" CLA-VAL 1063601H Check Valve
This is a specific model of a check valve manufactured by CLA-VAL. A check valve is a type of valve that allows fluid flow in only one direction. It prevents backflow, which can damage equipment or cause other problems.
The "3/8"" indicates the size of the valve's connection, meaning it is designed to fit a 3/8-inch pipe.
If you need more specific information about this particular valve, such as its material, pressure rating, or temperature range, I recommend consulting the technical documentation provided by CLA-VAL.