Follow these simple steps to replace your humidity indicator card inside the plug:
Hold housing by the 1.375” hex flange.
Insert a 1/2” hex wrench (Allen wrench) into the lock screw & turn counter-clockwise to loosen.
Remove the lock screw.
Remove the Teflon washer.
Remove the old humidity indicator card.
Install a new humidity indicator card.
Install Teflon washer.
Install the lock screw.
Hold housing by the 1.375” hex flange & torque lock screw to 50+/-5 inch-pounds.