Well, I wrote to the seller and asked about the history of the pumps ... and here is his response:
"Bumped" would not explain the loose control box, but everything else seems to add up to a really great deal leaving me with no sleepless nights!Hello, The pumps are new overstock and could have gotten bumped in the warehouse. They have been out there for over a year. If you can't use them let me know and I'll send you a replacement. Sorry for the inconvenience.
Does anybody else need a TACO 006 at an unbelievable price? Just go to the big auction site and do a search for "taco circulator".