It's funny this is coming up now. I am literally elbow-deep in a SWC160, pulling it apart to replace the pump (the motor full-on crapped out).
I bought a Sicce PSK1000, which looks to be almost a perfect replacement for the Atman pump... except for the fact that the Sicce doesn't have a base for it. I am halfway through machining a base for the pump. Once that's done, it's more or less a drop-in replacement. I got my Sicce from Avast Marine. It was the best pricing I could find and it came with a new venturi, which saves me having to spend time making the old venturi fit.
There are still a few places, like eBay, where you can find the atman pumps for about $60. This was my third atman to fail but is still love the skimmer, hence why I picked a Sicce for a replacement.
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