Vacuum System Plastic Can Liner Bags PB4MKThis VacuMaid central vacuum system bag 4m is a replacement for vacuum systems with 12" dirt canisters with air channel. It works in the DC1200 vacuum system and the bottom cans for single piece systems. This bag makes emptying the dirt in the canister a breeze. Just unclip it, remove the bag, and throw it away. No more dumping the canister into a trash bin. This is a package of 4 liners.