Here's the first test of my DIY spray bar attachment I made for my Eheim ECCO 2232. Its just an 8" length of 1/2" PVC with an end cap. Nothing is silconed together it just fits tightly on its own. I had to sand the edges of the pvc to make it fit on the tubing correctly but all in all this cost me $1.50 and took maybe 3 minutes to make with a power drill and some sand paper.
The holes need to be widen a bit because the flow is too strong at this size. The filter and spray bar are going on my 55g planted tank as soon as it comes out of dry start in about 4 weeks.