This 283 code key is used as a replacement key for Larson Storm Doors. Your key should be stamped 283. A Larson storm dfoor does not have a code anywhere to determine what key was used. Normally you will have to replace the entire lock assembly. In order for this key to work, your original key must be stamped 283. If your key code is unknown, find the serial number / model number from a sticker inside your door. Contact Larson for a key or lock replacement at that time.