To make a more rigid design I made a version where shroud and thread are one part (Shroud&Thread.stl). I just added it to the other files.
Also I modified the connector so it can be printed upright without supports. Due to needed layer adhesion I recommend using only PETG when printing this upright. For all other materials I recommend printing the connector lying down as suggested below. Supports are only needed in case of printing the connector horizontally.
I made this so I can fill my 300L aquarium without the hassle of carrying a filled heavy bucket around for half an hour. It connencts to the standard tubes that come with aquarium accessories. I made this modular so you can modify it easier and replace parts if needed. The thread is a tight fit. Increasing the x & y scale by 1 or 2 percent might help. The knob is removable so you can tighten it with an adjustable wrench. If you have problems with the connector (breaking or else) try printing it out lying flat on the bed as I did. A little Sanding should smoothen the surface enough to make it watertight.
0,2 for thread & shroud, 0,1 for connector
Supports only needed for the connector when printed lieing flat (what I recommend).Print the connector in 0,1 to safe yourself some sanding and make it more watertight.
Happy printing! =|:-3