This ¾ inch PVC adaptor is specifically designed for use with the Toroidal Windmill. Simply attach its bottom to one end of the PVC pipe and insert the windmill rod into its top. You can purchase the ¾ inch PVC pipe at Home Depot.
I adore this windmill; it looks stunning in my backyard, and the birds love it too. I designed the 3/4 inch PVC adapter and mounted the windmill on it.