King Kooker WKAF1B High Pressure Burner with Orifice Block

How long is the stem on this burner from where the round burner connects to the stem to where the stem ends at the regulator connector?

Does this need a thermocoupling? Where does it go?

what btu is this? can i connect this to a low pressure regulator? is it safe to do so? the regulator i have is about 80,000btu.

King kooker wkaf1b high pressure burner with orifice block fit a king kooker 24wc/092015/po#257009