This I guess is kind of like the Venturi but haven't seen any of the postings with pictures like this. It probably will only work with AGP's unless you can find where to attach the PVC. In total it cost me about 3.50 at HD though I already had the tie wraps and pvc cutter.
As you can see in the picture. There is just one 3/4 T and I bought 2 of the ready cut 2 ft sections of 3/4 pipe @ HD.
I first cut one of the 2 footers in half and placed it in the T but the down piece was not even with the return. so I cut the other 2 footer longer so that it would even up with the return. With the remaining pieces I made sure that the piece pointing down would cover over have of the return jet when in the down position. I tied it up on the frame, turned on the filter and I now have some cheap aeration.