Double-head square ratchet wrench for refrigeration and HVAC work What it does and why you need it Double-head square design gives two working positions in one tool, so you can tighten and loosen connection valve stems quickly and securely. Square (four-sided) head grips valve stems to reduce slipping and rounding, improving task speed and control in confined spaces. Compact ratchet function provides faster, more efficient turning than a fixed wrench, saving time during repeated adjustments. Key benefits Versatile: One tool covers multiple valve sizes and common refrigeration/HVAC tasks, reducing the number of tools you carry. Durable and reliable: Constructed from durable, wear-resistant materials to withstand heavy use and deliver consistent performance. Compact access: Slim, low-profile heads and ratcheting action make it easier to work in tight or hard-to-reach areas. Specifications and compatibility Tool type: Double-head square ratchet wrench (Doppelkopf-Vierkant-Ratschenschlüssel) Function: Securely tighten and loosen connection valve stems in cooling systems Sizes included: 1/4", 3/8", 3/16", 5/16" Applications: HVAC systems, refrigerators, freezers, radiators, compressors and other refrigeration equipment Practical use scenarios Air conditioning service: Remove and reinstall valve cores and service fittings on residential or automotive AC units without slipping or damaging valve stems. Refrigerator and freezer repair: Reach and turn small access valves behind panels or inside tight compartments when replacing components or diagnosing leaks. Compressor and radiator maintenance: Quickly loosen and tighten connection fittings during compressor swaps, line repairs, or radiator servicing where access is limited. What to expect in everyday use Precise, secure engagement on square valve stems to minimize rounding and rework. Reduced effort and faster operation thanks to the ratchet action. A single compact tool that covers several common sizes used in refrigeration and HVAC work. If you need a compact, dependable ratchet wrench that fits multiple valve sizes and performs reliably in tight spaces, this double-head square ratchet wrench provides a practical solution for refrigeration and HVAC professionals.