Mastercool 55103-A — R744 CO2 2-Valve Piston Manifold Class 1 - 1/4" SAE

Professional 2-valve piston manifold specifically designed for R744 (CO2) transcritical refrigeration systems. Features Class 1 construction with 1/4" SAE connections for reliable, leak-free operation in high-pressure CO2 applications. Precision-engineered piston valves provide smooth, accurate control of refrigerant flow in demanding commercial refrigeration service.

Key Features:

• R744 CO2 Specific – Designed for transcritical CO2 systems
• 2-Valve Piston Design – Smooth, precise refrigerant control
• Class 1 Construction – Professional-grade durability
• 1/4" SAE Connections – Standard HVAC/R fittings
• High Pressure Rated – Handles extreme CO2 pressures safely
• Precision Machined – Leak-free valve operation
• Professional Grade – Built to Mastercool standards

Specifications:

• Model: 55103-A
• Type: 2-valve piston manifold
• Refrigerant: R744 (CO2)
• Valves: 2 piston valves
• Construction: Class 1
• Connections: 1/4" SAE
• Application: CO2 refrigeration systems
• Gauge Compatibility: 70mm CO2 gauges
• SKU: 55103-A
• Barcode: 700376133455
• HS Code: 90262080

Piston Valve Technology:

Piston valves provide superior control compared to traditional ball valves, offering smooth, progressive refrigerant flow adjustment. The piston design creates a more precise seal and allows for fine-tuning of refrigerant flow rates – essential for accurate charging and recovery operations in high-pressure CO2 systems.

Class 1 Construction:

Class 1 construction indicates professional-grade materials and manufacturing standards designed to withstand the extreme pressures and demanding conditions of transcritical CO2 refrigeration. The robust construction ensures long-term reliability in commercial refrigeration service applications.

Applications:

• Commercial CO2 refrigeration service
• Transcritical CO2 system commissioning
• CO2 refrigerant charging and recovery
• Supermarket refrigeration maintenance
• Cold storage facility service
• Natural refrigerant applications
• CO2 cascade system service

Compatible R744 CO2 Gauges:

• 55102-1400 — R744 CO2 Low Pressure Gauge 70mm
• 55102-2400 — R744 CO2 High Pressure Gauge 70mm

Related CO2 Manifolds:

• 55102-A — R744 CO2 2-Valve Piston Manifold Body Only
• 55661-A — R744 CO2 2-Valve Piston Manifold 3-150

Why Use CO2-Specific Manifolds?

• Pressure Rating – Designed for extreme CO2 operating pressures
• Safety – Handles transcritical pressures safely (1,400+ psi)
• Leak-Free Operation – Precision machining ensures reliable seals
• Professional Standards – Meets requirements for CO2 service
• Piston Valve Control – Superior flow control vs. ball valves
• Durability – Built for demanding commercial applications

Transcritical CO2 Systems:

Transcritical CO2 refrigeration systems operate at significantly higher pressures than traditional refrigerant systems, particularly on the high-pressure side where pressures can exceed 1,400 psi (10 MPa). This requires specialised manifolds with high-pressure ratings, robust construction, and precision valves capable of controlling refrigerant flow under extreme conditions.

1/4" SAE Connections:

Standard 1/4" SAE flare connections provide compatibility with industry-standard hoses, gauges, and equipment. The SAE (Society of Automotive Engineers) standard ensures reliable, leak-free connections across different manufacturers' equipment.

Operating Instructions:

Connect CO2-specific gauges to manifold gauge ports. Attach 1/4" SAE hoses to service ports. Connect to CO2 system service valves. Open piston valves slowly and progressively for smooth refrigerant flow control. Monitor pressures carefully – CO2 systems operate at much higher pressures than traditional refrigerants. Close valves fully when service is complete.

Maintenance:

Inspect piston valves regularly for smooth operation. Check all connections for leaks using appropriate leak detection methods. Keep valve stems clean and free from debris. Store in protective case when not in use. Never exceed maximum pressure ratings. Replace valve seals if leaks develop.

Professional R744 CO2 2-valve piston manifold with Class 1 construction and 1/4" SAE connections. Designed for transcritical CO2 refrigeration service with precision piston valve control.