Product Description

Mastercool’s CO2 couplers are specially designed for use on R744 systems. These couplers meet the SAE specifications for containment of refrigerant while providing a premium design with easily adjustable open and close knobs.

  • Meets SAE J639
  • Reliable, self-locking construction
  • Provides precise filling with an adjustable opening
  • High pressure resistance with a burst pressure of ≥ 8700 psi (60 MPa)
  • Easy disconnect with automatic pressure relief


  • Refrigerant: R744
  • Connection: 1/4” SAE
  • High quality C3771BD brass with bright nickel plating
  • High side dimensions: 75 mm (h) x 40 mm (w)
  • Low side dimensions: 80 mm (h) x 40 mm (w)
  • Weight: 1 lb 7 oz

84834-CO2: High side R744 coupler

84934-CO2: Low side R744 coupler

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