[V12|V12]

Hrmm... I'd have to disagree... The simplest way is letting gravity do all the work! Your inlet should be at the highest point and outlet the lowest. That way air has 10x more of a chance of escaping the water flow. It starts at the top and most likely will end up there, rather than starting at the bottom and then, and it will, get sucked back into the outlet if you do it that way. I tried something like that and switched to a large 1" inline PVC-"T" That works pretty well, but I'm going to make a res from a mini NyQuil bottle or just cut some plexi and make a thin rectangle... I know one thing is that you shouldn't even attempt to use PE (polyethylene) plastic bottles, most epoxies don't bond to well to them. Aka the same waxy like plastic milk jugs are made from.

I swear by this plastic welder/epoxy mix: Devcon III fusion. It's part welder/high tensile epoxy! 35oo PSI max, 3-4 working time, 15min set...FULL strength in ONE HR!!!

good luck