The Mastercool 54272 2-Way Aluminum Manifold Gauge Sets 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 four 72" nylon barrier hoses with auto shut-off valves, 3 1/8" silicone dampened gauges for smooth needle movement, displaying R404A, R407C, R507A and R134a refrigerants pressure and temperature correlations in PSI, Bar and °F.