RATCHET WRENCH 1/4", 3/8" & 3/16", 5/16" Port Valve HVAC/Refrigeration Tool Straight, Heavy Duty, for open/close square Service Valves Four Sized: 1/4" and 3/16" at one end; 3/16" and 5/16" on the other end. This tools replaces Articco, Edison, Everwell, Appliparts and many other brands Specially designed for use HVAC access valves in hard to reach places Flip to reverse.