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RickW

What size thruhull for 2000gph?

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I have two 2000gph bilge pumps. I plan on putting one of the 2000gph below the aft cabin and the other 2000gph pump in below the front cabin. My boat is water tight and does not leak so there is rarely if ever any water in the bilge. These pump are just for an emergency situation so I would like each pump to have its own thru-hull fitting. What size thru-hull do I need for the 2000gph pumps? do I need to use seacocks in combination with the thurhull's? I plan on using an anti syphon lupe as long as I have the room. Any advise is very much appreciated. 

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I use thru-hull fittings that are the same size hose as the pumps output.  Seacocks are always a good idea especially if the thru-hull is close to the waterline because if the pump fails and the boat sinks below the thru-hull fitting closing the seacock could save a total loss.  An anti-syphon loop will prevent any waves or wash from going into the bilge.  You want to mount the thru-hull as high from the waterline as possible to a point.  The higher it is from the pump (head) the less water the pump will move.  If the height is more than 3 feet, expect a 20% loss in volume.  So a 2,000 gph pump would only pump 1600 gph.
 

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