This is a replacement part for the valve key for a Viega Manabloc manifold. The key is required to open and close the individual valves on the manifold.
The plastic on these parts becomes brittle with age and break.
This part can be printed with the diamond-shaped hole down toward the print bed. You may not need supports if your printer and material do well with overhangs. Otherwise, use supports for the cleanest print. This can also be printed with the broad side of the handle part flat to the bed, with supports.
The author marked this model as their own original creation.