I have been using the auto drum for a couple years now. The auto drum does not leak. I am using AA#2 and 5 and it meters very well, when it is dialed in it drop that amount time after time. if you are using new disks you may have to check to make sure the disks ride flat on the on the surface of the base if not sand the disk a little, make sure all the o ring are good and not twisted.

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Carpriver.