Weber Genesis 1000 LX NG Owner's Manual page 16

Step 12
Check that all burner valves are off
You will need: one burner control knob.
Valves are shipped in the OFF position, but you should
check to be sure. 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.Figure 13.
Figure 13
Step 13
Connect flexible hose to manifold
You will need: the 12 foot natural gas supply hose and a
3/4 inch wrench.
Thread fitting end of hose onto manifold. Figure 14 (a).
Tighten with wrench.
16
(a)
Figure 14