This print is creates a replacement diverter valve for a 1997 and earlier Dimension One spa. This valve is apparently NLA.
Note that you need to print both the cap and valve. The factory valve uses a hex shaped connector between the parts and I used a square peg (better fit).
For the final print I used I used a heavy infill % and thicker walls.
Part fit extremely well in our tub. Printed with PLA; will be interesting on how long it lasts.
Edit 1 : May 2019, updated text, title to be more accurate