On Beemer I have a thru hull and seacock under the sink that feeds the head. 
Was fine in lakes but now with seawater it's less than my liking. Always had to 
have seacock closed as would overflow the head on a port tack. 
I plan to plumb from onboard water supply this spring. They have a kit if I 
plumb from
Pressure water side of sink in head. Currently leave the head on dry and pour 
from cup on the sink. Works fine and no odors. 

Bob
Beemer, 29mkii, 309

Sent from my iPhone

> On Apr 18, 2016, at 10:04 PM, Randy Stafford via CnC-List 
> <cnc-list@cnc-list.com> wrote:
> 
> Listers-
> 
> If you'll humor me again, I'd like to get your comments on how the head on my 
> boat (30-1 #7) is currently plumbed.
> 
> The intake hose is teed into the vanity sink drain to its through hull.  The 
> discharge hose goes to a holding tank only (no Y-valve for overboard 
> discharge).
> 
> It's the intake hose I'm wondering about.  I suppose with the vanity sink 
> drain through-hull seacock closed, e.g. when underway, I could pump fresh 
> water into the head by first pumping it into the vanity sink and letting the 
> sink drain.  When not underway, with the vanity sink drain through-hull 
> seacock open, I could pump raw water into the head.
> 
> Does that sound reasonable, or is my boat's head intake plumbing screwy?
> 
> Thanks,
> Randy
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