Mechanical Manifold Gauge Set Number of Valves 4 R-12 R-22 R-502 Number of Hoses 4 60 in 0 to 800 psi 30 in Hg to 350 psi 3/8 in Oversized Internal Passages for Faster Evacuation Precision Flutter and Pulsation Resistant with Protective Gauge Boots UL Recognized