This handle fits over the valve handle on a hose splitter. This one came from Ace Hardware. They also sell a plastic one with same shape handles.
Parameters allow for some modification to the size and shape of the hole, big end, small end, and overall length (OAL).
Helps a lot when the handles are stuck, and keeping it on a string/chain means I won't have to go find pliers.
The author marked this model as their own original creation.