[Paddlewise] foot pumps

I'm seriously thinking of installing a footpump.  It was 
interesting to read about the manufacturer of the Henderson 
foot pump and other possible sources.  I've been surprised at 
how expensive the pump is, compared to $50-80 for most 
similar pumps with levers in the West Marine catalog.  Is there 
a spring or some other mechanism to return the diaphram 
after it has been pressed with the foot?  It doesn't seem that 
would justify such a high price.  I have a couple of questions 
about the pump: Does the pump hold water in it after 
pumping?  What sort of check valves and thru-hull fittings are 
needed or recommended?  Any comments about placement 
and installation of the thru-hull?  What are the dimensions of 
the pump, including the foot pedal?  Can you supply a phone 
number or address for Fawcett's?  Thanks for the information.
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