I built mine based on Homebrew58's design the You Tube video. i used a 5" pvc coupling, a 1/2" cpvc pipe through the center, and the clamp and 5 gal. strainer bag. Easy build but a few issues during the boil: the hop bag got so full it slid off the coupling b/c there is no lip to help secure the worm clamp. The coupling needs a channel or a lip to sit on top of to keep it more secure. Also the cpvc pipe was bending like crazy. the other issue was clogging. I recirculate my wort during the boil, so I decided to place the hose inside the bag to help with hop utilization. Well, the bag got so clogged up with hop pellets and hot break sludge that the wort level inside the bag was several inches higher than the wort level outside the bag. It was almost a disaster!
The next time i will add my hops to the boil without the hop strainer bag and then use the pump to recirculate the wort through the bag at flame out. After the entire batch has circulated through the bag i will then run it through the plate chiller. If any one has thoughts on this let me know...