Plexi is light, I'm sure, but tubing is even lighter... the res at the end of the tubing, 2 inches away, could simply be suspended in the case, with a wire.
Anyways, I still am clueless about that 1 3/4 thread.
I was doing some reading last night and I've got something to share with you: your jet port may not be optimal:
In the pic below (excuse the crudeness of it, I just drafted it this morning) there are 3 different types of openings.
a) your opening (I am assuming).
b) another type of opening, which compresses the fluid to a focusing point (horizontal arrow), at a distance from the bottom of the opening equal to half the diameter.
c) a Nozzle design, specifically to focus flow straight out of the hole. The curve (in red) is calculated and is an ASME standard.
(plexi in light blue, water in dark blue)
I'm not saying that you would be better off with something like this, but you might consider it. I still believe that you might be better with no restriction at all, which would give you a better flow.
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