Dewatering pumps.

[Sybarite]

Do you have a dewatering pump on your boat?

The Coast Guard crew, aboard a 41-foot Utility Boat, boarded and attempted, but was unable to save the boat using a dewatering pump.

The top versions have reverse valves when they are known as rewatering pumps.

 

[prv]

A dewatering pump is just a bilge pump, isn't it?

Although I got the impression it tended to refer to a small one used to remove the occasional nuisance water, shaft seal drippings, etc, and not a high volume try-to-save-the-boat kind.

Which is obviously the opposite to what they are saying here.

I would call that a salvage pump, especially if driven by its own petrol or diesel engine.

Pete

 

[RobbieW]

I think you're describing word usage from a country that considers deplaning to be an acceptable verb describing the act of exiting an aeroplane

 

[Hoolie]

... ... and imminent disembarkation as "we will be deplaning momentarily"

 

[penfold]

Posh name for a bilge pump; they are often called that on ship general arrangement drawings.