Mastercool 58531 Valve Core Remover/Installer Kit – For R134a Standard & JRA Valve Cores – Service Under Pressure Without Releasing Refrigerant – Includes Adapters & Carrying Case

Efficient Valve Core Replacement for R134a SystemsThe Mastercool 58531 Valve Core Remover/Installer Kit offers a reliable, technician-focused solution for servicing R134a systems with Standard and JRA-style valve cores. Built to work under pressure, this kit allows for fast, clean valve core replacement without the need to evacuate or recover refrigerant—saving time and reducing service costs.Simplified Coverage for Daily UseThis streamlined kit is perfect for mid-level shops, mobile technicians, or anyone who frequently works on standard R134a valve cores. It features a high-quality brass valve body with a stainless steel ball valve for system isolation, along with two dedicated shafts for servicing the most commonly used valve cores in R134a systems.Compact, Durable, and Ready for the FieldEverything stores neatly in a rugged blow-molded case, making the 58531 a dependable tool for everyday A/C service needs.What's Included:Valve assembly with stainless steel ball valveStandard valve core shaftJRA R134a valve core shaftHigh side R134a connectorLow side R134a connectorBlow-molded carrying case

• ✔️ Replace Valve Cores Under Pressure – Quickly remove and install valve cores in R134a systems without discharging refrigerant, saving time and materials.
• ✔️ Designed for Standard & JRA R134a Cores – Includes two dedicated core shafts to handle the most common R134a automotive valve core types.
• ✔️ Ideal for Mid-Level Shops & Mobile Techs – Covers a wide range of vehicles using standard and JRA-style cores with less bulk than full universal kits.
• ✔️ Heavy-Duty Performance in a Compact Package – Durable brass valve body, stainless steel internals, and precision-machined shafts ensure long life in shop conditions.
• ✔️ Integrated Ball Valve for Fast Isolation – Allows the technician to safely isolate system pressure during core removal or installation.
• ✔️ Protective Carrying Case Included – Rugged blow-molded case keeps all parts organized, clean, and protected on the job.
• ✔️ Backed by Mastercool’s Proven Innovation – Built on Mastercool’s original patented design for safe, efficient valve core servicing under pressure.
• ✔️ Supported by Mastercool’s U.S.-Based Team – Trusted worldwide for professional-grade A/C tools, parts, and support.