The G248 code is made for Illinois lock applications and is a double sided key. Be sure and compare the line drawing of the keyway shown in the example key blank, to the face of your lock. It should match and will determine if this is made for your lock. Key will be cut to code and ready to work in the lock.
This code is shown being used for the Thetford potable waterfill water door on Airstream models made between 1972-1974. It may also be used on other applications as well.