Name: Mastercool 58490 R134a Valve Core Remover/Installer Kit – Works Under Pressure – Covers Standard, JRA, Eaton Cores – Includes Shafts, Adapters, R134a Fittings & Case
SKU: 425178

✔️ SERVICE VALVE CORES UNDER PRESSURE – Remove and replace valve cores without discharging the system using built-in shutoff and ball valve control.
✔️ UNIVERSAL R134a COVERAGE – Works with standard valve cores (0.210-36), JRA (M6 x 0.75), and Eaton-style cores (8mm & 10mm threads).
✔️ COMPLETE ADAPTER SET INCLUDED – Comes with high and low side R134a connectors (13mm and 16mm), plus multiple shafts and adapters for maximum coverage.
✔️ IDEAL FOR PROFESSIONAL TECHNICIANS – Designed for full system compatibility across most R134a passenger vehicle platforms.
✔️ DURABLE, FIELD-READY CONSTRUCTION – Features brass body, stainless steel ball valve, and hardened steel shafts.
✔️ INCLUDES MOLDED CARRYING CASE – Keeps all adapters, shafts, and connectors organized and protected.
✔️ ORIGINAL MASTERCOOL DESIGN – Built on patented technology originally developed by Mastercool, trusted by professionals for decades.
✔️ TRUSTED QUALITY AND U.S. SUPPORT – Mastercool delivers over 40 years of A/C service innovation with responsive, U.S.-based customer support and technician-first design.

Replace R134a Valve Cores Without Discharging the System

The Mastercool 58490 Valve Core Remover/Installer Kit allows technicians to remove and install valve cores while the system remains pressurized—saving time and preventing refrigerant loss. Designed for R134a systems, this tool includes high and low side connectors and a patented shutoff valve for safe service under pressure.

Comprehensive Coverage for Standard, JRA, and Eaton Cores

This professional-grade kit is compatible with standard (0.210-36), JRA (M6 x 0.75), and Eaton-style (M8 and M10) valve cores used in most R134a automotive systems. It includes multiple core shafts and port adapters to support a wide range of vehicle platforms.

All-In-One Kit for Professionals

The 58490 includes everything technicians need: R134a high and low side connectors, interchangeable shafts, and precision adapters—all stored in a durable molded case.

What's Included:

Valve core remover/installer with shutoff valve
R134a high side (16mm) connector
R134a low side (13mm) connector
1/4" FL swivel connector
Standard valve core shaft
GM large bore valve core shaft
JRA valve core shaft
Eaton low side valve core shaft (8mm)
Eaton high side valve core shaft (10mm)
High side GM/Ford adapter fittings
Molded carrying case

Trusted Quality and U.S.-Based Support

Mastercool has been a leader in A/C tools for over 40 years. This tool is built on our original patented technology and backed by responsive, U.S.-based customer support.

Mastercool 58490 R134a Valve Core Remover/Installer Kit – Works Under Pressure – Covers Standard, JRA, Eaton Cores – Includes Shafts, Adapters, R134a Fittings & Case

Product Details

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