ADVANCED VALVE CORE TECHNOLOGY: Instant replacement of leaking valve cores without polluting releases. Saves time on repairs and reduces the need for costly refills. DUAL PORT COMPATIBILITY: Fits 1/4 inch and 5/16 inch SAE connectors; ideal for HVAC split systems, mini split units, vehicle air conditioners, and refrigerant lines. Versatile for numerous applications. PROFESSIONAL DURABILITY: CNC machined aviation aluminum body with a ball valve handle for smooth operation under pressure. Magnetic tip secures stuck valves while the metal cap resists wear. FAST 5 MINUTE : Left hand thread design prevents accidental disassembly. Ergonomic ridged handle ensures easy handling even with gloves. Suitable for DIY enthusiasts and technicians working on residential and commercial facilities. Use scenarios Use in HVAC split systems and mini split units during service or leak to quickly a leaking valve core and minimize refrigerant loss. Use in automotive air conditioning lines for on site repairs where access is limited, benefiting from the tool's durable construction and magnetic tip. Use in commercial or residential refrigeration setups with pressure refrigerant lines to restore operation quickly with a reliable valve core replacement.