3D printable nut and base for (https://www.printables.com/model/739528-danis-indoor-grow-towers) retains the twist lock function of the original bulkhead for these towers. Designed to go into a 5" hole from a hole saw drilled into a 5 gallon bucket lid. Simply drill a 130mm or 5" hole into your reservoir of choice and lock in place with nut.

This is still in progress, and should be printed at the users discretion. I'm uploading my files along the way, and do not certify they will work, though I do my best to only upload functional prints.