KitchenAid 740-0781 Installation Instructions And Use & Care Manual page 16

3. Connect the quick connector on the other end of the 
10' (3.0 m) PVC flexible gas supply hose to the rigid Natural gas
supply pipe (B).
A
B
A. Brass connector
B. Quick connector
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Change Grill Main Burner Valve Orifices
1. Remove the grates and flame tamers.
2. Remove the screw and clip that hold the burner in place. Set the
screw and clip aside. Remove the burner from the grill by lifting the
burner out.
3. Use a 6 mm socket and wrench or 6 mm nut driver to remove the
brass orifice from the end of gas valve. The main burner NG orifice is
located behind the LP orifice, so no additional orifice needs to be
installed.
A
A. Main burner orifice
4. Reinsert the burner and reattach using the screw and the clip
previously removed. Repeat the procedure for each main burner.
5. Position the igniters so they are ¼" (6.0 mm) away from each burner.
Change the Rotisserie/Infrared Burner Orifice
1. Using a Phillips screwdriver, unscrew the 2 screws and remove the
rotisserie/infrared burner wind baffle.
A. Wind baffle
A