Air Line Regulators employ a solid piston and balanced poppet for excellent performance and longer life. The solid piston design is reliable for a broad range of demanding applications and is impervious to a wide range of oils and greases. Amflo Air Line Regulators have fast reverse flow capabilities, allowing installation where dual pressures are required. Maximum inlet pressure: 300 PSI. Temperature range: 0 degrees F to +175 degrees F Gauge included. 1/box.