Brass construction: Brass body for durability in harsh environments and a long service life. Prevents coolant loss: Easily connects to hoses and features an unscrewing cap for quick, convenient use, helping to minimize coolant loss during maintenance tasks. Leakproof design: Sealing device prevents leaks and reduces the risk of cold exposure to hands during operation. Wide compatibility: Compatible with R22 and R410 connectors for refrigeration maintenance and construction projects. Use scenario 1: Infield service on R22 or R410 refrigeration systems during routine maintenance or leak testing, where reliable sealing and minimal coolant loss are important. Use scenario 2: Hose connection and disconnection tasks during component replacement or system checks, enabling quick access with the unscrewing cap while maintaining control over coolant loss. Use scenario 3: Construction or installation projects that require safe, reliable refrigerant handling and leak control in challenging environments.