Update 07/29/20: I had to reprint this piece as somehow I lost the previous one, and have modified the file to be much easier to print. The "Intex_Handle" file is the updated version with a flat back to it to be laid down and printed without any support. This model will now print without any supports and will not remove any function of the original part. Enjoy!
TL;DR: No supports neccesary on new model.
0.6mm Nozzle, 0.2-24 layer height, PETG or other strong material.
I printed this at 0.32mm layer height with a 0.6mm nozzle for strength and layer adhesion, however, I would actually recommend printing this with a bit smaller layer height to decrease the amount of support necessary underneath and to maintain proper roundness.
I printed this with the rounded sides down to minimize support material, and have layers running the length of the print where force will be exerted against.
PETG was the filament of choice as this needs to endure a decent bit of force and sitting outside in the sun every so often. PLA is not recommended unless you keep your pool supplies in proper containers 95% of the time.