Vacuum, low side, high side, and refrigerant lines are individually connected and controlled. 3/8" vacuum port and oversize internal passages evacuate systems four times faster than ordinary manifolds. 3/8" port has greater area than combined inlets of high and low side lines. Deep vacuum valve design. Unique patented gauge design provides superior resistance to shock, vibration and pulsation for accurate performance and extended gauge life. Supplied with our UL recognized premium color coded refrigerant hose. Ergonomic handles on valves give non-slip operation, even with oily fingers. Swivel hanger. Manifolds are available with a variety of gauge calibration options including gauges for R-134a.