Mastercool 84934-CO2 R744 CO2 Low Side Service Coupler 1/4" SAE

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.