The Mueller BU-5223-A-4-BLK part is a 1/2 inch forged steel ball valve that is rated for high-temperature and high-pressure applications. It has a black stainless steel body and male NPT connections. This valve is suitable for use in a variety of industrial, commercial and residential applications including gas, water, oil, steam and other fluid services. It features a two-piece rugged construction and has a bubble-tight shutoff when the handle is in the closed position. The valve is equipped with full port construction and includes a blowout-proof stem and anti-blowout stem packing. It is also UL/FM listed and meets ASME, ASTM and ANSI standards.