The 90008-998 is a BACK PRESSURE VALVE .50 PVDF/FKM TRUE-UNION 20MM SOC CONNECTION manufactured by BLUE WHITE. This valve is made of PVDF material, known for its exceptional chemical resistance and durability. With its true-union 20mm socket connection, it offers easy installation and maintenance. The FKM seals ensure a secure and leak-free connection. Suitable for various industrial applications, this valve delivers reliable and efficient back pressure control.