>>Sounds like the Whittleston (??) pump from New Zealand.  I don't know
whether they are still made, but they were unique and had a good reputation.
 I think they were inspired by the dairy industry. <<

Ros, yes, this is the one I was thinking of, and I'd be interested to see if
anyone else has heard of this pump or seen it.  Actually, I think that it was
called "Whittlestone", or something like that.

-Lisa