weber 55204 - Manual (Page 17)

B-7
Check that all burner valves are off
You will need: burner control knobs.
Valves are shipped in the OFF position, but you should
check to be sure that they are turned OFF. Put the
knob on each valve. Check by pushing down and
turning clockwise. If they do not turn, they are off.
Proceed to the next step. If they do turn continue
turning them clockwise until they stop., then they are
off. Proceed to the next step. Connect flexible hose to manifold
You will need: the 12 foot natural supply hose and a
3/4 inch wrench.
Thread fitting end of hose onto manifold. Tighten with
wrench.