I just recently made a fountain myself. I ended up learning by trial and error.
here is my thread.
This picture should help with the parts..
Using a bunch of the threaded ends (male and female) to make multiple parts will give you the most configuration options.
Plus, they screw in quickly. for cooling I've been using the L piece and "lazy L" and the nozzle goes at the end of that. Both connectors have all threaded ends, one male and one female. The threaded female pieces fit inside so I glued them directly. all other pieces have a small piece of PVC in between, probably no longer than 2.5"
setup for cooling: remove nozzle and plug male end of connector one in its place, connector #2 - male end into female end of connector 1, the nozzle is then screwed into connector #2, check my thread for more pics and a video. hopefully this all makes sense.
I should have taken more pics during the creation process, but since I wasn't sure what I was doing, I didn't take any.
I will take some pics of the parts when I work on a (temporary) waste pipe. I'm going to probably make it in 15-20 pieces. Which will take a bit of time to assemble but they screw together quickly, and a 100' backwash hose takes a long time to wind back up, I'm thinking at one or two times per month between backwash and blowing off water, I don't mind assembling and taking down a temporary pipe, my hose gets caught under the fence, builds pressure and blows a hole. :grrrr: