1/2" Barbed adapter for cheap Submersible Pumps

Description: 
These are adapters for Submersible pumps. 2 have odd sizes which fit my cheap Amazon pumps

Printables wouldn't allow me to have the . in .526 (meaning ") in the file name. So if your curious what 526 means. thats why.

I own an ActiveAqua Submersible pump and I lost my other adapters for it . I searched everywhere to buy some adapters and I couldn't find the correct ones for my pump!
So, I bought a cheap pump on Amazon... Sadly the 1/2" or .51 barbed was a touch too small.

I decided to copy the adapter with 3d printing characteristics. I made the barb .526 which fits perfectly!
However, the threading was much harder to find. 
I started off with 3/4-16 by counting the threads; about 14 to 16 per inch. Didn't fit!
Maybe it was Metric? The thread pitch was 1.8mmish which looked odd but maybe I was measuring it wrong? So I printed both M20 1.5 and 2 pitch. Correct size but not correct thread.
At a loss, because it wasn't 7/8" I didn't' know what to do??? until I figured it out. It was an M20 with 14 threads per inch. YES A MIX of both metric and US measurements. 
Almost perfect... it was a bit lose
So 2A means loose fitting; which still tightens onto the pump. and 2B means tight. Its tight!

Hopefully this helps someone.

I spent less time making sure the other threads were correct. Mostly trying to find out what my pumps threads were. So, if your pump has a real M20 or 3/4-16 thread and it doesn't fit perfectly. I have included the CAD files for you to change it a bit.

I printed this on my Prusa MK3S with a .4 normal nozzle and .10 fine detail PETG. Also think about using a tiny skirt to keep it on the bed if your having a hard time keeping thin prints stuck to the bed.