So I take it you're putting the inlet of the pump directly onto the res via some form of adapter? Not sure but isn't your inlet 3/4" npt (shot in the dark, specs would help)
You could grab a 7/16" drill bit and a 1/4"-18 npt tap along with any old 1/4" npt - 1/2" barb. That'd take care of your res inlet. For the res outlet / pump inlet you could find a 1/4" npt to 3/4" npt male/male (or male/female depending on what the pump inlet is) and use the same tools above. Or to really get flow going, which seems to be the entire point here.... Grab a tap for the same npt size as your pump inlet and buy the apropriate male/male (or again male/female depending) adapter. Then drill/tap holes accordingly, thread on your fittings with either silicone sealant on the threads or some good ol ptfe tape.
For bonding acrylic:
-Find a GLASS jar that you dont' mind trashing.
-Get a small scrap of acrylic and mash her into bits with a hammer. (don't need a ton)
-Put bits in jar and dump acetone in on top
-For say a 2" diameter jar with say 1/2" of bits o acrylic on the bottom fill up say... 1.75" of acetone. Stir occasionally ( hours apart ) and just let it work it's magic overnight.... LID ON THE JAR
-Keep waiting till it's 100% liquid that's not exactly water but not so much of a gel either, experiment with the consistancy on scrap arylic to find what you like to work with best... add acetone to water down, let set with no cover to thicken up.
-Apply carefully to one surface and push together.... let sit for a few hours and the bond is absolutly strong as hell.
Basicly all of that is to make a glue that more or less will melt the two pieces together into one, makes a crystal clear seam if done right.
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