85103-MRB

2-Way Piston Valve Manifold for Automotive — 80mm Gauges (Manifold Only - No Hoses)

Mastercool is the leading manufacturer of professional-quality A/C manifold gauge sets. The 85103-MRB is a manifold-only option featuring precision-machined piston valves and large 80mm colour-coordinated 4-scale gauges for R134a, R22, R12, and R404A. This manifold-only configuration is ideal for technicians who already have hoses or want to build a custom setup. Designed specifically for automotive A/C service with 1/4" SAE fittings.

Manifold Only - No Hoses Included

This is a manifold-only product (85103 series) that does NOT include hoses. It's perfect for:

• Technicians who already own hoses
• Replacing a damaged manifold whilst keeping existing hoses
• Building a custom manifold setup
• Upgrading to larger 80mm gauges
• Spare manifold for workshop use

Key Features

• Manifold Only: No hoses included - manifold block with gauges only
• 80mm Gauges: Large size for easier reading from a distance
• 4-Scale Gauges: Versatile for R134a, R22, R12, R404A
• Free-Floating Piston Valve: Less wear and tear compared to twisting piston valves
• Double O-Ring Seal: Much better seal resulting in fewer leaks
• Solid Extruded Aluminium Body: Durable construction
• Extra Access Port: For vacuum line connection
• Silicone Dampened Gauges: Smooth out needle movement
• Field Re-Calibratable: Gauges can be easily re-calibrated to maintain accuracy
• Extra Large Sight Glass: Visual refrigerant check
• Large Easy-Grip Knobs: Comfortable operation
• 1.6 Gauge Class: Professional standard accuracy
• Colour-Coordinated: Easy refrigerant recognition
• Automotive Specific: 1/4" SAE fittings for automotive A/C

Technical Specifications

• Model: 85103-MRB
• Type: 2-way piston valve manifold only (no hoses)
• Gauge Size: 80mm (larger than standard 63mm)
• Gauge Class: 1.6
• Gauge Type: MRBH-MRBL (R134a, R22, R12, R404A)
• Body Material: Solid extruded aluminium
• Valve Type: Free-floating piston valves with double O-ring seals
• Manifold Fittings: 1/4" SAE (automotive standard)
• Compatible Refrigerants: R134a, R22, R12, R404A
• Hoses: NOT included (manifold only)
• Carrying Case: NOT included (manifold only)
• SKU: 85103-MRB
• HS Code: 90262080

Applications

• R134a automotive A/C service
• R22 legacy automotive systems
• R12 classic automotive A/C systems
• R404A applications
• Automotive A/C installation and maintenance
• Replacement manifold for existing hose sets
• Custom manifold configurations
• Workshop spare manifold
• Upgrading from 63mm to 80mm gauges

4-Scale Gauges

The MRBH-MRBL gauges provide versatile refrigerant compatibility:

• R134a: Modern automotive A/C standard
• R22: Legacy automotive systems
• R12: Classic automotive A/C systems
• R404A: Specialised applications

Free-Floating Piston Valve Advantage

Unlike traditional twisting piston valves, Mastercool's free-floating piston valves move straight in and out, resulting in:

• Less Wear and Tear: Longer service life
• Better Sealing: Double O-ring design for fewer leaks
• Smoother Operation: Easier to operate under pressure
• Professional Standard: Superior performance

Complete Manifold Sets with Hoses

If you need a complete manifold set with hoses and quick couplers, choose from these options:

With 180cm Hoses and Quick Couplers:

• 89772-MRB — R134a/R22/R12/R404A 80mm with 180cm Hoses and Couplers
• 89772-MRB-G — R134a/R22/R12/R404A 80mm with 180cm Hoses, Couplers, and Gauge Protectors
• 89772-MRBC — R134a/R22/R12/R404A 80mm with 180cm Hoses, Couplers, and Case

With 250cm Hoses and Quick Couplers:

• 89996-MRB — R134a/R22/R12/R404A 80mm with 250cm Hoses and Couplers (if available)

Related Manifold-Only Models

80mm Gauges:

• 85103-MB — R134a/R404A/R407C/R22/R507A 80mm Manifold Only (5-scale)
• 85103-MRB — R134a/R22/R12/R404A 80mm Manifold Only (4-scale) - This Product

63mm Gauges:

• 85103-M — R134a/R404A/R407C/R22/R507A 63mm Manifold Only (5-scale)

What You'll Need

Since this is a manifold-only product, you'll need to provide your own:

• Hoses: 3 × charging hoses with 1/4" SAE fittings (e.g., 40372 for 180cm or 40396 for 250cm)
• Quick Couplers: Optional (e.g., 82834-E, 82934-E)
• Carrying Case: 58102-PBR plastic carrying case (optional)
• Gauge Protectors: Optional (add "-G" suffix when ordering complete sets)

Optional Accessories

Gauge Protectors:

• To order with shock-resistant gauge protectors, add "-G" after the part number

Carrying Case:

• 58102-PBR — Plastic carrying case

Replacement Parts

• 85215 — O-rings (4 pieces)
• 85216 — Seal and seat assembly (2 pieces)

Why Choose Mastercool Piston Valve Manifolds?

• Professional Quality: Constructed of finest materials
• Precision Machined: Highest quality standards
• Built to Last: Every manifold built for long service life
• Free-Floating Piston Valves: Less wear, better sealing
• Double O-Ring Seals: Fewer leaks, better performance
• Solid Aluminium Body: Durable construction
• Colour-Coordinated Gauges: Easy refrigerant recognition
• Large 80mm Gauges: Easier to read from a distance
• 4-Scale Versatility: Works with multiple refrigerants
• Silicone Dampened: Smooth needle movement
• Field Re-Calibratable: Maintain accuracy over time
• Extra Large Sight Glass: Visual refrigerant check
• Automotive Standard: 1/4" SAE fittings

Perfect For

• Automotive A/C technicians
• Mobile automotive service
• R134a automotive A/C service
• R22 legacy automotive systems
• R12 classic automotive service
• Technicians who already own hoses
• Replacing damaged manifolds
• Building custom setups
• Workshop spare manifolds
• Upgrading to 80mm gauges
• Technicians working with multiple refrigerants

Maintenance

• Regular Inspection: Check gauges and valves for wear
• Gauge Calibration: Re-calibrate in the field as needed to maintain accuracy
• Valve Operation: Ensure piston valves operate smoothly
• O-Ring Replacement: Use 85215 when needed
• Seal Service: Use 85216 seal and seat assembly when required
• Sight Glass: Keep clean for visual refrigerant checks
• Storage: Store in a safe, dry location when not in use

Professional Quality: Mastercool piston valve manifold gauge sets are built to professional standards with precision machining and finest materials for reliable, long-lasting performance. The 85103-MRB 2-way piston valve manifold features large 80mm colour-coordinated 4-scale gauges for R134a/R22/R12/R404A, solid extruded aluminium body, free-floating piston valves with double O-ring seals, and field re-calibratable gauges. This manifold-only configuration (no hoses included) is ideal for automotive A/C technicians who already have hoses, need a replacement manifold, or want to build a custom setup for professional automotive service operations.