Breeze or Freeze? The Essential HVAC Tools Every Smart Homeowner Needs to Know
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What square-drive hand ratchet is used to open or close standard HVAC service valves?
Explanation
An HVAC Service Valve Wrench is a specialized four-sided square socket ratchet. It features exact 3/16 inch, 1/4 inch, 5/16 inch, and 3/8 inch square sockets designed to slip over structural service stems without stripping their soft brass heads.