Weber 500 Series Owner's Manual page 16

Step 14
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 15.
Figure 15
Step 15
Connect LP tank
WARNING: Make sure that the LP tank valve is
closed. Close by turning clockwise.
Hook the LP tank onto the fuel scale. Loosen the tank lock
wing nut. Swing the tank lock down. Tighten the wing nut.
Figure 16.
Figure 16
Route the hose so it will not interfere with the scale
indicator rod.
The hose and regulator are connected in the following
manner:
Slide back the collar of the quick disconnect on the tank
valve. Push the male fitting of the regulator into the quick
disconnect, and maintain pressure. Slide the collar closed.
Figure 17 (a). Figure 17 (b) shows the quick disconnect
engaged and various components of the tank and
regulator. Regulator vent hole should be at 3, 6, or 9
o'clock. It should not be pointed up. Figure 17 (c).
Tank lock
wing nut
16
(a)
Male
fitting
Hose
Tank valve
Regulator
Regulator
vent
Quick disconnect
engaged
(c)
Figure 17
Collar
(b)
Valve handwheel
close clockwise
Pressure
relief valve
Tank
Turn so regulator vent
does not collect water