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【Compatibility】This hvac locking cap key matches perfectly with R410A and R22 refrigerant locking caps, compatible with most residential and commercial air conditioning equipment. As a universal refrigerant locking cap key tool, it fits standard AC service valves, suitable for refrigerant system maintenance, valve core disassembly and AC installation tasks. It belongs to practical hvac service tools that meet daily work demands of professional hvac technicians and DIY repair enthusiasts, and works with refrigerant cap lock and all standard refrigerant safety caps. | 【High Quality】Constructed with premium solid metal material, this refrigerant key maintains steady performance under frequent long-term use. Every bit head of this hvac locking cap tool undergoes precise machining to keep stable clamping force during repeated disassembly of hvac locking caps. The metal surface adopts anti-rust finishing to adapt to damp working environments of outdoor AC units, serving as a long-lasting refrigerant tool to supplement your complete hvac tools list.