Intex PureSpa Filter Circuit Cap

I do a lot of DIY plumbing work on my Intex PureSpa, and it's far too wasteful to empty 250 gallons of water each time. These caps thread on to the two internal filter ports and the filter loop return port so that the tub doesn't gush water when you unscrew the OEM plumbing on the outside.

You definitely need at least 3, but you might want two more to cap off the outside for even less leaking.

The thread is 1.75"-12 scaled 104.5% in X/Y, and 93.8% in Z (this is already done in the uploaded model). It must be at least 20mm deep so that the TOP surface bottoms out on the hot tub wall, rather than the interior surface like a normal cap.

For more info: https://www.alexwhittemore.com/intex-inflatable-spa-plumbing-caps/