Your head inlet teed to the sink drain is exactly the way my 38 is plumbed. I think that arrangement was pretty common in the 70s.
My question is why you would close the sink drain seacock when under weigh. I have a shut off valve in the inlet line between the seacock and the head that is near the head, and the lever on the head that is marked “Flush” and “Dry” is always left on “Dry” – and either of these should prevent inlet water from siphoning into the head when the boat is heeled while sailing. Is your boat plumbed with a shutoff valve near the head? Personally, I close all my seacocks a couple of times a year to make sure they are moving freely and they remain open the rest of the time; though I know there are some on the list who close all the thru hulls when they leave the boat for a week or two as insurance against a hose leak. Rick Brass From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Randy Stafford via CnC-List Sent: Monday, April 18, 2016 11:04 PM To: cnc-list <cnc-list@cnc-list.com> Cc: randy.staff...@comcast.net Subject: Stus-List Head Plumbing 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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