Tim, the 3rd prong is for a pilot light.

Last edited by cletis; 03/04/2016 5:09 PM. Reason: deleted mistaken info

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.