The ASTM A995 4A Plug Valve is a valve made from duplex (austenitic-ferritic) stainless steel castings that meet the ASTM A995 standard, specifically designed for pressure-containing parts. This type of valve belongs to the group of ferrous stainless steel alloys. Plug valves are quarter-turn manual valves used primarily for starting or stopping the flow of fluid. They offer on-off, diverting, as well as basic moderate throttling services. Due to their material and design, these valves are suitable for applications requiring high pressure and corrosion resistance.