Mastercool 91337 R12/R134a Valve Core Repair Kit

R12/R134a/R1234yf Valve Core Repair Kit

Comprehensive valve core repair kit for R12, R134a, and R1234yf refrigerant systems. This professional kit includes 50 replacement valve cores covering all common valve types plus a valve core remover/installer tool. Essential for HVAC/R technicians servicing automotive and refrigeration systems.

Kit Contents

• 0377-001: Standard Access Valve Core R12/R134a/R1234yf (20 pcs)
• 0378-001: GM Large Bore Valve Core R12/R134a/R1234yf (10 pcs)
• 0531-001: R134a/R1234yf JRA High/Low Import Valve Core M6 (10 pcs)
• 0769-001: R134a/R1234yf Domestic Eaton SSV High Flow Valve Core M10 (5 pcs)
• 0768-001: R134a/R1234yf Domestic Eaton SSV High Flow Valve Core M8 (5 pcs)
• 81290: R12/R134a/R1234yf Valve Core Remover/Installer (1 pc)

Key Features

• Complete Kit: 50 valve cores plus remover/installer tool
• Multi-Refrigerant: Compatible with R12, R134a, and R1234yf
• Comprehensive Coverage: Standard, GM large bore, import, and Eaton SSV types
• Professional Quality: Genuine Mastercool replacement parts
• Ready to Use: Everything needed for valve core service

Technical Specifications

• Model: 91337
• Type: Valve core repair kit
• Compatible Refrigerants: R12, R134a, R1234yf
• Total Valve Cores: 50 pieces
• Valve Core Types: Standard, GM large bore, JRA import M6, Eaton SSV M10, Eaton SSV M8
• Tool Included: Valve core remover/installer (81290)
• SKU: 91337
• HS Code: 84818099

Applications

• Automotive A/C service (R12, R134a, R1234yf)
• Refrigeration system maintenance
• Valve core replacement and repair
• GM vehicles (large bore cores)
• Import vehicles (JRA M6 cores)
• Domestic vehicles with Eaton SSV valves
• Mobile service operations
• Workshop environments

Why Replace Valve Cores?

• Leaking Valves: Worn cores cause refrigerant loss
• Preventive Maintenance: Replace during system service
• Contamination: Damaged cores can introduce debris
• System Integrity: Fresh cores ensure proper sealing
• Professional Standard: Replace rather than reuse

Related Valve Core Products

Master Kits

• 58490 — Universal R12/R134a Valve Core Master Kit
• 58490-YF — Universal R1234yf Valve Core Master Kit
• 91337 — R12/R134a/R1234yf Valve Core Repair Kit - This Product

Valve Core Remover/Installer Tools

• 91490 — Standard Valve Core Remover Installer Tool
• 91496 — Valve Core Remover Tool HVAC Service
• 91498 — Universal Valve Core Remover Installer R410A

Specialised Tools

• 58490-378 — GM Large Bore Valve Core Remover Tool
• 58490-768 — Eaton R134a Low Side Valve Core Tool

Replacement Parts

• 91490-K — Replacement Tip & Pin for 91490/6/8

Valve Cores

• 90377-20 — Standard Valve Core (20pcs)

Installation Kits

• 90376 — Valve Core Removal Installation Kit 6 Cores

Perfect For

• HVAC/R service technicians
• Automotive A/C specialists
• Mobile service operators
• Workshop environments
• Technicians servicing multiple vehicle types
• R1234yf system service
• R134a system maintenance
• R12 legacy system service

Professional Quality: Mastercool valve core repair kit provides comprehensive coverage for R12, R134a, and R1234yf systems with 50 replacement cores covering standard, GM large bore, JRA import, and Eaton SSV types, plus a valve core remover/installer tool for complete valve core service capability.