Covermate III Lock Black 100841

Covermate III Locknut Black 100841

Nylon Lock Nut in black zinc.

There are 2 of these in a typical Covermate III installation. One for each ball stud.

You may also need the 5/16 ball stud for CMIII cover lifter. See 100244

Each lifter also has 2 of these .

When installing the ball stud and locknut on a Covermate III cover lifter, follow the Covermate III installation instructions - "install the ball studs to the left and right pivot arms. Note: Be sure that the ball is pointing away from the spa"