Originally Posted by MikeR
the factory compressor is designed to refill the tires without the fix-a-flat connected... the fix-a-flat junk is designed with an input for you to hook the compressor and a little output hose the connects to your wheel.... compressed air pushes junk from can into your tire....
So you have a nice backup.....

Pretty much. It even has a nice empty slot for it in under the mat in the trunk.