[Paul F]

I prefer 1/2" hose for better flow vs the 3/8 most sell. The Northern 1/2" version on the page you linked is likely the same unit I bought from Harbor Freight (looks identical). Surprisingly nice quality for HF. I'd recommend it.

Harbor sells a swivel adaptor to swivel the whole unit from the ceiling.

I used plain old schedule 40 PVC in the walls.