This Thing is a replacement plug and cap for the large inflate/deflate port of a big inflatable kids pool. It has two parts:

• A plug that pushes inside the large inflate/deflate port ("inflatable pool plug.stl")

• A cap that screws on over the plug ("inflatable pool cap round smoother.stl")

The cap part is a remix of Inflatable Pool Cap by jag. Thanks to the publishing of the openscad source for that Thing, it was a simple tweak to change to a round exterior (instead of hex) and set more stepsPerTurn / $fn for higher resolution curves on the threads. (I chose 120 steps per turn instead of the default of 24 steps per turn, which gave a little smoother result given the overall size of the part.)

A shout out as well to syvwlch for developing the awesome and useful screw library. That library makes the threads in the cap, so be sure to download it if you want to tinker with the openscad source for the cap.