This brake valve is constructed barstock. The valve disk is a lost wax casting of silicon bronze, and combined with a Teflon valve seat minimises by-pass leaking.
It comes complete with inlet and outlet unions for 3/16″ tube silver-solder connections and is ready to install.
Vent port is un-tapped. Spring and screws are stainless steel.
Body diamter is 1-18″. Height is approximately 2″.