2 5ltr concentrators will noway run ether of those torches.
You would do much better to get the 7port Dragon,that is what the center fire is on my Bullet and I use two concentrators for that and I don't need the outter unless I make something very big with boro.I use a Tank for the outer flame.My Bullet is the same as the 21 port cept it has a seprate inner and outter.
G.
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