This is functional but a work in progress

All you need (other than a 3d printer) is some 3/8 tubing and you'll have a fun summer toy!

Gasket: You can print the included gasket out of TPU or steal one from something else for the hose connection.

Print Settings: I recommend you in PETG or a material which wont get soft in the sun. Of course PLA will still work. Just don't leave it out. I did print all of the parts at 100% infill. Less will probably still work but I'll leave that up to you to try.