you have two located so the other two should be for the engine intake for cooling and the head discharge and in mine there is a thru hull for the head sink ddrain and intake for the head under the cabinet in the head
You probably have four - - Head sink drain and head raw water intake share the same seacock. - Galley sink drain - Raw water intake for engine is next to engine on its port side. May have a filter that collects trash and should be periodically cleaned out. - Holding tank discharge next to engine intake (for use only when three miles out to sea). This may not apply to your situation and may not be on your boat. Having all of these located, you'll find it takes only a minute to close them when leaving the boat.
The previous responders have given the stock locations, but there may have been changes. For example, my holding tank discharge had been re-located to behind the fuel tank. One safe way of locating all would be to check the bottom of your hull to locate all the outlet holes.
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