Surprised it's 3D printed.  O-rings too small.
This is 3D printed.  And it has a sealant for small holes.  It looks like it will work for what I'm using it for.  However, the provided two rubber O-rings are too small for the spacing.  It leaks because there are small bumps on the underside of the tube, I think they are supposed to be spacers, but it does not allow the O-ring to compress to seal.  I changed out the O-rings and it work well.
Rating: 4 stars