[-PROOF DESIGN] Equipped with a double seal mechanism, these check valves ensure ultimate reliability by preventing any leakage. The brass filling valve, complete with a sealing cap, safeguards against refrigerant loss, enhancing efficiency for your refrigeration and air conditioning systems. [VERSATILE APPLICATION] Ideal for a variety of applications, these filling valves are essential in freezing, refrigerating, and air conditioning equipment. Their adaptability to different environments makes them a must-have component for both enthusiasts and professionals alike. [EASY INSTALLATION] Featuring a bonnet knurled design, the valves facilitate effortless installation and disassembly. This user-friendly approach ensures that you can quickly set up or replace the valves without hassle, enhancing your overall work efficiency. [COMPACT & PORTABLE] With a small size that guarantees easy portability, these valves are designed to be convenient for storage and usability. Perfect for on-the-go repairs or installations, they offer excellent performance without taking up much space in your toolkit. [DURABLE CONSTRUCTION] Crafted from copper and brass materials, these valves promise long-lasting durability and strength. With a working pressure of 3.0MPa and a medium temperature range of -25~120℃, they are built to withstand challenging operational conditions., Manufacturer: Jelquix