I know this is an old post, I was just doing a search on the Ampmaster 3000 as Fragzilla in Calgary was looking for a return pump. This pump works (worked) really well on my 120 corner tank. Anyway, I got the bearings in the motor and the mechanical seal done in my pump back in Dec for $100 at D.V. Electric Motors.
Wow, is 125 buck from the manufacturer and is it the upgaded seal?
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