Goplus 4CFM 1/3HP Air Vacuum Pump HVAC Refrigeration Kit AC Manifold Gauge Set R134 (Gauge Kit) Automotive A/C Manifold Gauge Set; Aluminum alloy manifold testing body with built in sight glass High or Low Pressure adjustable; 3 color-coded 5 FT. long service hose with storage attachment Pressure in PSI measurement; Extra large and easy to read color coded dials Each coupler have a shut off valve to prevent loss of refrigerant; Solid Brass connections Ideal for R134a; Quick disconnect couplers for high/low fittings included