The REFCO UNITOR FOUR WAY MANIFOLD GAUGE with CHARGING LINE is a versatile HVAC and refrigeration tool designed for charging, testing, and pressure purposes. This manifold gauge set features four valves and is capable of working with various refrigerants such as R-134a, R-407F, R-407c, and R-407a. The green-colored gauge set includes oil as the gauge fill and operates on a PSI vacuum unit. With its mechanical features and high-quality construction from the trusted brand Refco, this product is an essential tool for professionals in the HVAC and refrigeration industry.