This single-stage compressed gas regulator is machined from class A brass bar stock using state-of-the-art equipment. Produced, assembled and tested by an experienced, proud and dedicated work force that is committed to its highest standards of product integrity. High-quality regulators provide superior performance and safety features with an emphasis on value. Featuring internal safety pressure relief valves, they are lightweight and compact ideal for most applications. They come with self re-seating external safety pressure relief valve. All have standard 9/16″ B fittings. UL approved.