This is an adjustable inlet nozzle for 80mm inlet. It is entirely print in place and requires no assembly and no additional supports for printing. Simply give the top half a good hard twist to break off all the integrated supports and make it adjustable.
I printed this with PETG using a 6mm nozzle and 20% infill.
When trying to design some adapters for the pool, I found it difficult to find info on the threads to use in Fusion 360 so I've included the thread file for fusion to help others. Please view this post on how to use it: https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Custom-Threads-in-Fusion-360.html
I've also include the F360 archive file if you want to alter it.
The author marked this model as their own original creation.