Culligan Iron-Cleer aeration tank leaking to drain

[brentsid]

My Iron Cleer is leaking too drain from the aeration head from the larger drain line on the back of the head. It's old, like maybe 2007. I've rebuilt and repacked the media on the other media thank but haven't gotten into the aeration side yet except to clean the inlet of iron. Any advice appreciated. Found a used whole head for sale in unknown condition, but of course no parts. Culligan wants to replace it, which is why I had to learn to rebuild the other head

Thanks!