Ratchet Wrench Square head Port Valve tool 4-in-1 a must have tool for professional HVAC field service.
Ratchet Wrenches, Square 4 Sizes in one:
Straight, Heavy Duty, for open/close square Service Valves: 1/4" and 3/16" at one end; 3/16" and 5/16" on the other end. Flip to reverse.