Power flow
Very poor quality 304 s/s, mig welded poop!!!!!!! the bends are poor also.
Primary design are the main people for top of thge range stuff,their stuff IS the very best but at a price.
They do incernel,(a type of very light weight s/s) stainless steel.
If you want bends i can supply you with whatever you need,i only use 316L which would be best welded with tig and back gassed for max durability.
Cost for 90/45 degree bends start from £3.00 - £10.00 1"- 4" dia.
Chris