Features and Benefits: * Made of extruded aluminum for durability and long life * Piston type free floating valves reduce O-ring wear * Easy grip front facing knobs * Gauges include R134a Fahrenheit scale in SAE and Kpa measurements * Anti-flutter gauges smooth out needle movement This aluminum manifold set includes 90 degree Snap-N-Seal couplers. Other features include extra access port for vacuum line, extra large sight glass for visual check of refrigerant and gauges can be calibrated to maintain accuracy.