Back pressure regulator also known as priority valve is fully balanced, economical regulator. The regulator will improve moisture separator efficiency and filter life as much as 450%. This is done by maintaining pressure in the separator and filter at 1800 PSI or more when tank pressure is lower. It has two outlet ports permitting attachment of a filling yoke and gauge directly to the regulator. Suitable for separator and filter systems, compressors, control systems and cascading systems applications.