1. HVAC Service Wrench Set The service wrench hvac is designed for routine maintenance of air-conditioning and refrigeration equipment. The set includes sizes 1/4", 3/8", 3/16", and 5/16", which are the most commonly used wrenches when repairing air-conditioning and refrigeration equipment. 2. Valve Core Removal Tool Suitable for home air-conditioning or other refrigeration equipment. It provides dual size SAE 1/4" and 5/16" ports, making the valve core remover compatible with R22, R12, R407, R404, R410, R32, R600 A/C systems, etc. Not suitable for Automotive AC. 3. Great Design The valve core remover tool is made mainly of brass and features a ball valve that opens and closes with a quarter-turn. The curved design increases hand grip and helps prevent over-torquing a valve. Upgraded valve cores have a golden-yellow bottom, offering strong resistance to fluorine and heat and a longer service life than ordinary valve cores. 4. Material Hexagon head adapters use heat treatment and chromate surface to enhance hardness, abrasion resistance, and corrosion resistance, extending service life. The black part of the set is high-quality 45# steel with heat treatment; the silver part is A3 steel without heat treatment, providing a sturdy and durable wrench set. 5. Easy to Install Using these hvac valve core remover tools, the valve core rod can easily insert into the inner valve core to control and replace old valve cores quickly without refrigerant loss. You don’t need to stop the machine or release refrigerant. Note: Before removing the valve core, close the valve of the valve core wrench and disconnect the air conditioner’s inner connection. Typical use scenarios - Routine maintenance on home air-conditioning and refrigeration equipment - Quick valve core replacement on R22/R12/R407/R404/R410/R32/R600 systems without refrigerant loss - Servicing multiple small commercial or DIY refrigeration systems without special refrigerant handling tooling