The Mastercool 84934-CO2 is a professional low side service coupler specially designed for R744 (CO2) refrigerant systems. Engineered to meet SAE specifications with premium brass construction and reliable self-locking design for safe, precise refrigerant handling. Key Features SAE J639 compliant — Meets industry standards for refrigerant containment Reliable self-locking construction — Secure connection during service Adjustable opening — Provides precise filling control High pressure resistance — Burst pressure ≥8,700 psi (60 MPa) Easy disconnect — Automatic pressure relief for safe removal Easily adjustable knobs — Simple open and close operation Premium brass construction — C3771BD brass with bright nickel plating Technical Specifications Refrigerant: R744 (CO2) Connection: 1/4" SAE Pressure side: Low side Burst pressure: ≥8,700 psi (60 MPa) Material: C3771BD brass with bright nickel plating Dimensions (H × W): 80mm × 40mm Weight: 0.65kg (1 lb 7 oz combined with high side) Colour: Blue (low side) Applications Essential for servicing commercial refrigeration systems using R744 (CO2) refrigerant, including supermarket refrigeration, industrial cooling systems, and modern eco-friendly HVAC applications. Related Products 84834-CO2 — R744 CO2 high side service coupler, 1/4" SAE 55102-A — R744 CO2 2-valve piston manifold 55661-A — R744 CO2 2-valve piston manifold View our complete range of hoses and couplers for professional HVAC/R service solutions. Professional R744 CO2 service coupler for commercial refrigeration technicians requiring SAE-compliant, high-pressure rated equipment.
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