Through hull valve

spidercga · Post by **spidercga** » February 2nd, 2014, 3:03 pm

I just bought a 1997 Mariner 350 and absolutely love it. While in the process of learning the boat I discovered a thru hull valve in the forward bilge on the starboard side. This is a large diameter valve. It is closed and the hose goes towards the bow and then I lose sight of it.
I have no idea what it is used for. Anybody have any ideas?
thanks,
Dave L.

AaHubb · Post by **AaHubb** » February 2nd, 2014, 3:22 pm

Is it sanitation hose? Very likely it is a direct discharge hose from your marine head. There should be a Y valve to switch between direct discharge and the holding tank. There are also some CG regs concerning these valves you need to be aware of.

Post by **waybomb** » February 2nd, 2014, 4:16 pm

Or to the AC water pump?

Ramsport47 · Post by **Ramsport47** » February 3rd, 2014, 6:13 am

I'm betting on an overboard discharge for waste. The AC intake hose is typically 1" or less and, other than engines, there are no thru hulls larger than that.

spidercga · Post by **spidercga** » February 5th, 2014, 11:32 am

Thanks, I appreciate all of your responses. Maybe I wasn't clear enough with my description of the valve.
It is a large diameter valve (maybe 2 inches in diameter, the size of a waste hose).
The valve is mounted directly to the hull on the starboard side, and it appears to be for the purpose of raw water intake.
I don't know what it's for but, I have ruled out raw water intake for AC or waste.
As I said, one end of the valve is directly to the hull, the other end of the valve is connected to a 2inch diameter hose the runs forward underneath the forward stateroom (there is not head anywhere near there). After that, I have not idea.
Any further thoughts on the matter would be appreciated, before I started taking the stateroom apart piece by piece!
Dave L.

Ramsport47 · Post by **Ramsport47** » February 5th, 2014, 12:25 pm

Typically, on the 350 Mariner, the overboard waste pump is located under that floor. The pump is tied in to the deck pump out hose through a Y Valve. There is a hatch in the stateroom that you should be able to lift to see what's under there.

spidercga · Post by **spidercga** » February 5th, 2014, 1:05 pm

Thanks Kenny, nothing to see in the hatches, but with a little more effort I should be able to lift out an adjacent section by removing a few screws.

Through hull valve

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