This is an authentic Coleman lantern replacement part. It is a small brass nut that is used to hold the burner assembly in place on the fount (the fuel tank). This genuine OEM part is made specifically for this purpose so it is guaranteed to work. One nut is included.
This is a small metal piece made by Coleman for lanterns. It is designed to sit on the base of the Burner Assembly (part # 288B5341) beneath the Nut (part # 288-1641). The generator fits through this part. It is sold individually.