Tru-Flate airline 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 lubricating oils and greases. Unlike diaphragms, the solid piston resists rupture, cracking or tearing under pressure, constant flexing or high-cycle rates. It is impervious to most chemicals, provides accurate control and assures smooth, uninterrupted operation. Tru-Flate airline regulators have fast reverse flow capabilities, allowing installation where dual pressures are required. Feature 2 ga ports and include pressure gauge and non-rising, locking knob adjustment. Maximum pressure 250 psi primary, 2 to 125 psi secondary.Non-rising, locking knob adjustment