The Mastercool 89772-M 2-Way Aluminum Manifold Gauge Set with 183cm Hoses with Manual Couplers and 63mm Gauges come complete and ready to work. With features like solid extruded aluminum body, large knobs, free-floating piston type valves, silicone dampened gauges that are easily re-calibrated in the field for increased accuracy. Includes set of three 183 cm hoses with manual couplers, 63 mm silicone dampened gauges for smooth needle movement, displaying R134a refrigerant pressure and temperature correlations (Metric).