Feature: 1. Sealing Cover: Air conditioning filling valve, with sealing cover, double sealing to ensure no leakage, stable and reliable to use. 2. Multi Purpose: Widely used in various parts of freezing, refrigeration, and air conditioning equipment, an essential accessory for HVAC systems. 3. Easy Installation: The valve cover adopts a knurled design, which is easy to install and disassemble, and is suitable for adding fluorine. 4. Brass Material: Selected high-quality brass material, sturdy and durable, wear-resistant and corrosion-resistant, and have a long service life. 5. Exquisite Craftsmanship: Small size, exquisite workmanship, stable performance, suitable for R22 R12 R134 refrigerant.