This is a factory rubber plug for all F250 F350 trucks with a square fuel filler door.
This plug is used to cover the hole on trucks that have gas engines.
The same bed is used on gas and diesel trucks and on diesel trucks the DEF filler neck comes through the smaller hole next to the fuel filler neck.
On gas trucks this hole is not used.
If you have an open hole and want to cover it for cosmetic purposes, this is the correct plug.
Simple snap in installation.
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TOM DUGANS TRUCK PARTS
659 Airport Road, Lawrenceville Ga 30046
P: 770-962-5678
FORD F250 F350 FUEL DOOR DEF BLOCK OFF HOLE PLUG $14.95