R134a manifold gauge set is used in the pressure test of Refrigeration system . Anti-flutter gauges smooth out needle movement, Easy grip all-metal side-mounted knobs, Piston type free-floating valves reduce O-ring wear, Manual R134a couplers, 60" red, blue and yellow inner nylon layer hoses meet EPA, SAE, Yellow hose includes shutoff valve . Aluminum R134a set comes complete with 60" hoses and R134a manual couplers. Comes in custom molded carrying case.Professional R134a manifold gauge and hose set used to check both low and high side pressures while adding refrigerant . Kit features SAE approved 72" hoses (blue-low side; red-high side); 60" yellow charging hose