This is a 304 Grade Stainless Steel Ball Valve 1/2 BSP x 1/2 BSP with large 14mm Bore
These are made with nylon seals that are hard wearing and can handle boiling water and boiling wort.
High pressure ball valve suitable for mains water pressure if needs be. The full bore allows maximum flow rate.
These are rated to 1000psi for water oil and gas.