This Sixtel Stacker keg adapter is paired with a tapping keg stacker or a single storage stacker to stack slim barrel kegs on top of the 1/2 Barrel spacer. The adapter sits on top of the keg stacker, one side capable of holding a slim 1/4 keg and the other side capable of storing a 1/6 barrel keg. This keg stacker and adapter can be used for storage or transport when paired with the single storage keg stacker. When paired with the tapping keg stacker, this slim keg adapter allows you to tap and dispense two different beer choices at one time. Keg stackers sold separately.