Im actually making mine shorter. I also do not like the welds. You could easily use a piece of PVC or steel pipe instead. But when he said it was runing at 80PSI I didnt really care. A weld should easily be able to handel that.
I thought he said 280 psi.

EDIT: Yeah, about 20 seconds into the first video he says 280PSI. That's a little high for me. Must not have a very high flowing valve like your sprinkler.