Mastercool 33103-MRG 2-Way Brass Manifold – Piston Valves – 63mm Gauges with Protectors

Mastercool is the leading manufacturer of professional quality A/C manifold gauge sets. Our manifold gauge sets are constructed of the finest materials and machined with precision to the highest quality standards. At Mastercool, every manifold we build is built to last.

Key Features:

• Free Floating Piston Valve – Results in less wear and tear in comparison to market standard twisting piston valves
• Double O-Ring – Allows for a much better seal resulting in fewer leaks
• 63mm Gauges – 1.6 gauge class for accurate readings
• 4 Refrigerant Scales – Multi-refrigerant compatibility on a single gauge face
• Gauge Protectors (GP) – Shock-resistant protective covers included to safeguard gauges from damage
• Colour Coordinated – All Mastercool gauges are colour coordinated for easy refrigerant recognition
• Bar/°C Metric Scales – European standard measurements (gauge p/n MRH-MRL)
• 3 x 1/4" SAE Fittings – Standard connections for hoses and service equipment

Specifications:

• Model: 33103-MRG
• Gauge size: 63mm
• Gauge class: 1.6
• Scale type: Bar/°C with 4 refrigerant scales
• Refrigerants: R134a, R22, R12, R404A
• Gauge part numbers: MRH-MRL
• Connections: 3 x 1/4" SAE fittings
• Valve type: Free floating piston valves
• Material: Brass
• Includes: Shock-resistant gauge protectors

Gauge Protectors:

The GP (Gauge Protector) designation indicates this manifold comes with shock-resistant protective covers for both gauges. These protectors shield the gauge faces from impacts, drops, and rough handling during transport and field use, significantly extending the life of your investment.

Multi-Refrigerant Capability:

The 4-scale gauge face allows technicians to work with multiple refrigerant types using a single manifold. This manifold is calibrated for R134a, R22, R12, and R404A, covering both legacy and modern refrigerants commonly found in automotive and commercial refrigeration systems.

Safety Instructions:

⚠️ WARNING: Wear safety goggles. Avoid contact with refrigerant.

NOTE (R744): CO2 systems work under extremely high pressures. Only professional technicians are recommended to service these systems. Please use proper safety equipment while servicing.

Pre-Service Instructions:

1. Close both valves on the manifold gauge set by turning the high and low knobs clockwise.
2. The gauges are correctly calibrated at the factory before shipment. If calibration is required, remove the lens and insert a straight blade screwdriver into the adjusting screw on the gauge face (except liquid filled gauges).
3. Connect the (red) hose to the high port and the (blue) hose to the low port on the manifold gauge.

Testing and Charging:

To properly diagnose the problem in the R/AC system, first check the system's overall performance. This includes monitoring the system's pressure as well as leak testing. Your manifold gauge set will give accurate readings of your system's pressure.

NOTE: Be sure that the hand valves on the manifold gauge set are in the closed position. Always wear gloves and safety goggles when working with refrigerant.

1. Remove the protective caps from the system ports. Check for leaks at the ports.
2. Connect the low side service hose (blue) to the suction side of the compressor. Connect the high side service hose (red) to the discharge side of the compressor.
3. If using adapters, make sure that they are fully tightened and piercing the access valve. Failure to properly access the valve core will prohibit refrigerant flow.

Important Notes:

• A system that has been opened or one that is found to be excessively low on refrigerant pressure as a result of a leak, must be fully evacuated by means of recovery and deep vacuum. NOTE: Send recovered refrigerant for reclamation.
• A system that has been evacuated must be repaired, leak tested and evacuated to a required level of vacuum.
• If charging on the liquid or high side, use only the high side valve on the manifold gauge set. Make sure the low side valve is closed.
• After charging, test the system by turning it on and running the A/C with both valves closed on the manifold.
• After testing, disconnect the hoses from the system and make sure to use a recovery/recycling machine to evacuate any refrigerant remaining in the hoses or manifold.

Optional Accessories:

• Add "-T" suffix for teflon gaskets

Replacement Parts:

• 85215: O-Rings (4 pcs)
• 85216: Seal and Seat Assembly (2 pcs)

Packaging:

Packaged in a clamshell. For plastic carrying case, order part number 58102-PBR separately.

Important: The image shown may differ from the actual supplied product. Please check the model number, specifications, and description to confirm the exact gauge size, refrigerant scales, and configuration.