For those looking for a 20" clear housing with 1" brass outlets, I just got one on ebay for under $26. Search Stagon 20" filter housing.
Here are a few pictures:
I don't remember all the fittings I used for this. I just went to Home Depot and used what I found. I'm not sure why the housing said 1" fittings but my pvc fittings says 3/4' but it all works wonderfully and is connected after my Eheim 2075 filter with 16/22mm hoses. I do believe I used a 1-1/2" pvc with holes drilled in the bottom for the pipe inside the filter. It seems to not restrict water flow at all.