All drums are interchangable with the original tumbler and the HD tumbler. Drum includes seal and lexan door.     Please note: "extra" drums are not sold by themselves, only with the purchase of a tumbler. We are not in the business of supplying parts for DIY projects! If you have previously purchased a tumbler and would like to purchase extra drums, please include your invoice number or your email that you used to purchase one and we will look it up. If you are currently purchasing a tumbler with extra drum, you will automatically be granted access to do so.