the extra flow regulator will work perfect if you can hook two up to your bottle or you have an extra. my single regulator had an extra port and i pulled a line off of that for my purging. although it is regulated by the single regulator, i installed a valve to cut down flow once the inital purge is done. i leave it cracked during welding to make sure its good.
ive seen some cool plugs that would make swapping between tubes really easy. i didnt want to invest a ton of cash so i just taped up the ends. i just poked a couple small holes in the opposite end from the purge line, and started welding when a lit match would extinguish itself. worked really well and the difference was huge. it made the biggest difference when i had to fill a couple small holes that i couldnt do with a fusion weld.
just an opinion from a novice. id love to hear what the experts do.
