Ran across this by accident, and thought I would share. This setup will work well to plumb in 3 high pressure burners, such as the BG12 or BG10. It only has enough BTU output to feed two at once (at full blast), but for most users should be sufficient.
Just buy 2 of these regulators
from Academy, then combine them to control 3 burners rather than 2. Hoses, orifices, are included. The regulators are $20.00 each, pretty cheap for the regulator & hoses to handle 3 burners.