Mastercool 81490 R134a Valve Core Remover & Installer – Service Valve Cores Under Pressure – Compact Tool for Automotive A/C Systems with Internal Shutoff

Service R134a Valve Cores Without Discharging the SystemThe Mastercool 81490 Valve Core Remover & Installer is a compact tool that allows technicians to replace R134a valve cores while the system remains fully pressurized. With built-in shutoff functionality and both 13mm (low side) and 16mm (high side) connectors, it offers quick and efficient access to standard R134a ports.Know Before You BuyThis tool is designed for systems using standard R134a valve cores. It may not be compatible with certain Ford, GM, or Chrysler vehicles that use oversized or non-standard cores. Please verify your system’s valve core type before purchasing.Need Broader Compatibility?Mastercool offers additional tools to cover other valve core types:58490 Universal Kit – Works with Standard, GM Large Bore, JRA, and Eaton cores58560 Eaton Kit – Designed for Eaton-style cores (common on GM/Chrysler)58531 Kit – Covers Standard and JRA valve cores (common in Asian/European vehicles)What's Included:Valve core remover/installer with internal shutoff13mm (low side) R134a service port connector16mm (high side) R134a service port connectorHardened steel shafts for standard valve cores

• ✔️ REPLACE R134A VALVE CORES WITHOUT EVACUATING THE SYSTEM – Built-in shutoff valve allows technicians to remove and replace valve cores while the system remains fully pressurized.
• ✔️ WORKS WITH MOST STANDARD R134A VALVE CORES – Designed for vehicles that use 13mm (low side) and 16mm (high side) service ports with conventional R134a cores.
• ✔️ IMPORTANT FITMENT NOTICE – This tool does not fit all R134a vehicles. Some Ford, GM, and Chrysler models use oversized or non-standard valve cores.
• ✔️ FOR BROADER COMPATIBILITY – See Mastercool kits: 58490 (Standard, GM, JRA, Eaton), 58560 (Eaton-style), or 58531 (Standard + JRA cores).
• ✔️ COMPACT AND EASY TO USE – Simple one-piece design fits in your pocket or tool pouch, ideal for mobile or in-shop use.
• ✔️ DURABLE AND FIELD-READY – Features hardened steel shafts, a brass body, and a steel handle with rubber sleeve for comfort and control.
• ✔️ INCLUDES BOTH HIGH & LOW SIDE CONNECTORS – Comes with 13mm and 16mm service port adapters for quick connection to most R134a systems.
• ✔️ BUILT BY MASTERCOOL – Backed by over 45 years of experience in professional A/C tools and technician support.