Mastercool 58490-YF R1234yf Valve Core Remover/Installer Kit – Services Standard Valve Cores Under Pressure – Includes 17mm & 14mm R1234yf Fittings and Storage Case

Replace R1234yf Valve Cores Without Discharging the SystemThe Mastercool 58490-YF Valve Core Remover/Installer Kit is built specifically for R1234yf automotive A/C systems. Featuring a shutoff valve and precision-engineered 14mm and 17mm R1234yf service port connectors, it allows technicians to remove and replace valve cores while the system is fully charged—saving time and reducing refrigerant loss.For Standard Valve Cores in R1234yf PortsThis kit is compatible with standard valve cores (0.210-36), the same internal cores used in both R134a and R1234yf systems. However, it includes the correct R1234yf service port fittings required to safely connect to newer vehicle platforms.Durable, Professional-Grade ToolBuilt with a stainless steel ball valve, brass body, and hardened steel shafts, the 58490-YF is a reliable, technician-grade tool for shop or mobile use.What's Included:Valve core remover/installer with internal shutoff17mm high side R1234yf service port connector14mm low side R1234yf service port connectorStandard valve core shaftGM large bore valve core shaftEaton high side valve core shaftDurable molded storage caseMastercool Quality & U.S.-Based SupportWith over 40 years of expertise in A/C tools, Mastercool builds its equipment for professionals. This tool is based on our original patented technology and supported by responsive, U.S.-based technical support.

• ✔️ DESIGNED FOR R1234YF SYSTEMS – Safely remove and replace valve cores while the system remains pressurized using included 14mm and 17mm service port connectors.
• ✔️ WORKS UNDER PRESSURE – Built-in stainless steel ball valve and internal shutoff system allow core servicing without refrigerant loss.
• ✔️ FITS STANDARD VALVE CORES – Compatible with standard cores used in R1234yf systems (same internal core dimensions as R134a).
• ✔️ PRECISION CONNECTIONS FOR R1234YF PORTS – Includes correct high side (17mm) and low side (14mm) connectors required for R1234yf service ports.
• ✔️ COMPACT AND DURABLE – Rugged brass body, stainless steel components, and hardened steel shafts built for professional shop environments.
• ✔️ MOLDED STORAGE CASE INCLUDED – Keeps all adapters and shafts protected and organized.
• ✔️ TECHNICIAN-TRUSTED DESIGN – Based on patented technology originally developed by Mastercool, a U.S.-based industry leader in automotive A/C tools.
• ✔️ QUALITY YOU CAN COUNT ON – Backed by over 40 years of engineering and responsive U.S.-based customer support.