This gasket is for the model 227 and 427 lanterns, most winged style fuel caps, early 220B's, and other similar lanterns and lamps that have the older style cap insert.
It is the same outside diameter as cap gasket 118B1361 but has a smaller inside hole.
Old part number 115-1361.
This will not seal they typical Coleman lantern cap.
This gasket is for many lanterns, stoves, and lamps that take the standard 3 piece filler cap.
If your filler cap is a standard size and has a screw in the center then these gaskets will work.
Red 3 piece filler cap show for demonstration purposes only.