Stus-List Oft overlooked source of head odor

Shawn Wright shawngwright at
Sat May 25 13:04:49 EDT 2019

I like the idea of adding a tee in the sink drain for a fresh water flush -
Shawn Wright
shawngwright at
S/V Callisto, 1974 C&C 35

On Sat, May 25, 2019 at 9:13 AM Dreuge via CnC-List <cnc-list at>

> 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
> On May 24, 2019, at 12:00 PM, cnc-list-request at wrote:
> Date: Fri, 24 May 2019 09:08:21 -0500
> From: "Dennis C." <captbuy at>
> To: cnc-list at
> Subject: Re: Stus-List Oft overlooked source of head odor
> Message-ID: <1920A42C-7848-4BBC-BB20-C9D5985FDF08 at>
> 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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