Mastercool 83272 R1234yf 2-Way Piston Valve Manifold Gauge Set.

Features:

• Anti-flutter gauges smooth out needle movement
  
• Easy to read temperature scales on 3 1/2 inch gauge face (Bar/PSI/F/C)
  
• Easy grip front-facing knobs
  
• Piston type free-floating valves reduce o-ring wear
  
• E-Z to recalibrate gauges to ensure accuracy
  
• An extra large sight glass for visual checks of refrigerant
  
• Manifold block assembled with (3) 12mm-F fittings per SAE J2888
  
• Red & Blue Nylon barrier hoses with 12mm-M fittings on both sides meet SAE J2888, EPA, SAE & UL standards
  
• Yellow hose 12mm fitting on one side and 1/2 x 16 LH acme on the other meets SAE J2888
  
• R1234yf high and low side couplers with extended disconnect protection sleeve meet SAE J639 & J2888