I have seen heads discharge loops vented with a small hose led to an external vent. Some were with inline check valves but some without. The later was more common for anti-siphon at the raw water to exhaust mixing below.
I thought about added a hose to my head discharge loop if it became a problem. The longer the little rubber valve work, the more likely I’ll replace it as Dennis has done. The only head odor problem I have had was due to stagnate seawater in the inlet to head. I fixed this by teeing the head inlet to the head sink drain. When I leave the boat for an extended period, I now close off the seacock, fill the sink with some fresh water, and pump it through the head. No more stench. - Paul E. 1981 C&C Landfall 38 S/V Johanna Rose Fort Walton Beach, FL http://svjohannarose.blogspot.com/ > On May 24, 2019, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote: > > Date: Fri, 24 May 2019 09:08:21 -0500 > From: "Dennis C." <capt...@gmail.com <mailto:capt...@gmail.com>> > To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Subject: Re: Stus-List Oft overlooked source of head odor > Message-ID: <1920a42c-7848-4bbc-bb20-c9d5985fd...@gmail.com > <mailto:1920a42c-7848-4bbc-bb20-c9d5985fd...@gmail.com>> > Content-Type: text/plain; charset="utf-8" > > The anti-siphon valve on the vented loop is usually not routed anywhere. It > just sits on the top of the loop. > > It?s different from the tank vent. > > Dennis C. >
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