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I believe this is a water pump, sure is affordable, my work for tugs and such................. 
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NEED PARALLEL CONNECTORS?? QUALITY 5.5MM, 8MM, 8 AND 10 AWG, GET THEM HERE:
http://forums.offshoreelectrics.com/...est!&highlight= -
sorry, but that is not a pump, it is a pressure switch used to shut off a pump, before it over-fills the ballast tank/bag on a sub...
(specifically this sub)
all total, there are about a dozen parts that make up the ballast tank/bag, pump, controller and failsafe, totaling about $100.
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