3D printing things to make RV life easier, winterizing Edition

When winterizing an RV it is desirable to get as much water out of your system before you add the RV grade antifreeze. This keeps the water in the lines from diluting the antifreeze just enough to raise the freezing temperature and potentially cause issues.
You can readily available purchase this product. But when you have a 3D printer why buy what you can print in 30 minutes.
For sale on Amazon: www.amazon.com...
Link to file on printables:
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[@Dtr146]

As a complete noob to CAD software. I find it easier to open stuff up in mesh mixer and cut it up with the plain cut tool. Tinkercad has a 25 MB limit on STL files. I wish it was bigger but it just has an engine limit. The only way I could get my project into tinkercad was with mesh mixer and the reducing options to make it a smaller file