The Speed Control Muffler provides infinite metering of air flow. The sintered bronze is encased by an outer metal shroud. With linear adjusting capability, the speed of the cylinder can be decreased by adjusting the integrated screw. When optimal exhaust rate is reached, the lockout may be adjusted to prevent accidental adjustments due to vibration or other means. Maximum operating pressure: 300 PSI Temperature Range: 35deg-300degF (1.7-149C)