This Dalen replacement cup is a fitting for rotating owl decoy heads. It mounts onto the owl stem and holds the rotating head in place, letting you restore a decoy whose original cup has worn out or gone missing rather than replacing the whole unit.
This version is the newer circular fitting. The circular cup seats differently from the rectangular version, so match the fitting shape on your existing owl head to be sure the head attaches to the stem as intended. It works as a replacement accessory for rotating owl decoys used as garden pest deterrents.