I often get emails about buying or copying Coleman Camper Keys.

Only two types of keys were used in Colemans and Fleetwoods folding tent trailers for the pop out T handled access door lock.
1101X and 8025 key numbers!

The 1101X key was used for the access door lock on units built before June 1997.
The 8025 key was used for the access door lock on units built after June 1997.
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If you manufacture date is June 1997 or newer, your key should be the 8025.

751  is very common key is found on many aftermarket cargo and access door lock cams. If you have a compartment door that does not use the same key as your access door, then this is likely the key.
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You can sometimes get them make at your local hardware store or purchase online via ebay.com or http://colemanpopupparts.com/search?q=keys