Interesting, I will have a look at mine. Yours is vented outside the hull,
right? Mine has a hose, which I assume is connected to the holding tank
vent line, and then to the outside vent below the toerail.
--
Shawn Wright
[email protected]
S/V Callisto, 1974 C&C 35
https://www.facebook.com/SVCallisto


On Wed, May 22, 2019 at 12:10 PM Dennis C. via CnC-List <
[email protected]> wrote:

> I started smelling a little head odor recently.  I quickly traced it to
> the "duck bill" valve on top of the vented loop on the discharge hose.
> Like joker valves, these often overlooked valves can get scaled up and leak.
>
> To confirm, I dried the top of the valve cap assembly, gave the head a few
> hard pumps on wet flush and checked it.  Sure enough, the top was wet.
> Over time, this small amount of black water leaking into the boat will
> result in an odor.
>
> Depending on the manufacturer of the vented loop, replacing the duck bill
> is usually easily done.  Mine is a Forespar MF-841.  readily available for
> about $12 on Amazon or eBay.  I've replaced it at least once in 20 years.
>
> Hope this benefits the list.
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
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