Sure Heat 2008 Four Seasons FS38 Natural Gas Conversion Kit - Manual (Page 6)

Regulator hose
Fig. 21
Fig. 22
Fig. 23
Fig. 24
Fig. 20
FS388LP Natural Gas Conversion Kit Instructions
23. Hold the elbow on the bottom IR burner, then use the
supplied wrench to remove the orifice. Replace it with
the supplied NG orifice and secure it. (See Fig. 23)
24. Put the bottom IR burner back in to the grill, re-attach
the flex line and igniter wire, then push it back in
position. (See Fig. 24)
20. Remove the bread warming rack, main cooking grates,
flavor grids and set them aside. (See Fig. 20)
21. Remove the two (2) screws securing the bottom IR
burner in position. (See Fig. 21)
22. Pull the bottom IR burner out a little and disconnect the
flex line and igniter wire from it. (See Fig. 22)
Note: Make sure the wire does not fall into the
access hole.
Self-tapping screw
Self-tapping screw