pumps on K1

[NW Mailing List]

What does the large flat device on the fireman side of a K-1 do?
 
http://www.nwhs.org/archivesdb/detail.php?ID=990
 
Do you know where to get an HO scale one?  There are two smaller pumps (or whatever) on the engineers side.
What do they do?
 
Thank you,
Mike Shockley
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