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[REMOVE VALVE CORES WITHOUT REFRIGERANT LOSS] Featuring a highly reliable double O-ring ball valve seal structure, this tool securely isolates system pressure. You can safely remove and install Schrader valve cores without the need to shut down the machine or release system pressure, ensuring zero refrigerant leakage, saving valuable time, and preventing refrigerant waste. [FULL PORT DESIGN FOR MEGA FLOW & FAST RECOVERY] By removing the restrictive valve core, this tool opens a full-flow, unrestricted channel that significantly accelerates the entire servicing process. It doubles your working efficiency by drastically speeding up vacuuming, refrigerant recovery, and charging times, making it ideal for both professional technicians and DIY users. [UNIVERSAL 1/4" SAE INTERFACE & WIDE COMPATIBILITY] Equipped with a standard 1/4" side port, it perfectly fits most HVAC service ports. It is broadly compatible with mainstream refrigerants including R12, R22, R410A, R32, and R404A. This versatile tool is fully applicable to residential and commercial air conditioners, heat pumps, refrigerators, and automotive AC systems. [VACUUM-RATED & HEAVY-DUTY DURABILITY] Built to withstand extreme high and low-pressure conditions, this 1-pack brass-colored tool is exceptionally crafted from a premium blend of solid copper, stainless steel, and aluminum alloy. It is vacuum-rated down to 20 microns and boasts an impressive high-pressure resistance of up to 800 PSI, ensuring anti-corrosion, non-deformation, and long-lasting durability. [ERGONOMIC DESIGN & MULTI-FUNCTIONAL ESSENTIAL] Designed with a user-friendly anti-slip knob and a clear ball valve switch, working is remarkably smooth and easy even for beginners. Beyond simple valve core replacement, it is an essential complete kit for HVAC system maintenance, precise "blank off" vacuum testing, refrigerant charging, and leak detection.