This is actually my second atempt at this, my first version was done using copper elbows and 5 minute epoxy by lepage. It worked for about 3 months but eventually the 5 minute epoxy turned gummy and lost it's hold. This time I'm using jb-weld with pvc. I made the holes with a glass and tile drill bit, and then reamed it big with a dremel using a tile cutting bit. The glass drill bit isn't absolutely necessary but i have it handy. The whole thing could have been done with just the dremel. The powerhead is a maxijet 400.
If the Jb-weld epoxy holds up for 5 or 6 months, I'll go ahead and scale this up a bit and build one out of a 4 litre jar and a larger maxijet.
Picture to show the flow
This is being used in a 10 gallon shrmp tank. The flow is more than enough for me.