[C320-list] Holding Tank Vent

[Joseph R Aberdale]

Jeff,

I attempted to locate your photos of this project but cannot find them on the website. Perhaps you can provide me with some direction.

Thank you.

Joe Aberdale
#908

On Apr 1, 2012, at 7:49 PM, Jeff Hare wrote:

> Hi Mike,
> 
> The holding tank vent from the factory is a 5/8" fuel vent and vents out the side of the boat.  The hose leading to that is 3/4".  The factory used a makeshift technique to adapt the 3/4" hose to the 5/8" fitting. Not only is this prone to leak fumes, it isn't particularly waterproof.  If you have a boat with the Black plastic vent, this is designed in a way that can actually vent gasses back into the boat since no sealant is used on the fitting.  On top of that the baffles or screens in the vent prevents the tank from breathing.
> 
> Last summer I did a fairly simple project to replace the vent hose with a quality hose and installed a 3/4" thru hull fitting similar to the bilge pump outlet thru hull.  The result was instant and dramatic.  Went from having holding tank smell in the head and aft cabin closet whenever the head was flushed to zero smell inside or outside the boat.
> 
> This is (in my opinion) a must-do project.  Even though we flush with fresh water, there was always a smell in the aft cabin closet.  That is completely in the past now.  
> 
> There are pictures in my c320 website photo gallery of this project.  It took me a few hours one evening after work to do.
> 
> Jeff Hare
> #809 Woodbine II
> 
> 
> 
> 
> On Mar 30, 2012, at 7:03 PM, Jane & Ken <obuoy4848 at sbcglobal.net> wrote:
> 
>> Mike,
>> On hull #219 (OBUOY) the tank vent is the one under the rub rail and no stantion vent is present.  The "old" catalina boats did use the stantion as a vent--bad stuff on deck when over full.  Ken
>> 
>> --- On Fri, 3/30/12, Mike Ott <wmo48 at yahoo.com> wrote:
>> 
>> 
>> From: Mike Ott <wmo48 at yahoo.com>
>> Subject: [C320-list] Holding Tank Vent
>> To: c320-list at catalina320.com
>> Date: Friday, March 30, 2012, 12:53 PM
>> 
>> 
>> According to my owners manual ('98), it shows the holding tank vent exiting into 
>> a deck stanchion.  The stanchion has a small hole (1/8" +/-) through which the 
>> tank vents.  I also have, what appears to be, an overflow vent located in the 
>> hull just below the holding tank pump out deck-fitting.  Is this also acting a 
>> vent for the holding tank ?   The reason for my question is the Feb '12 article 
>> in Practical Sailor that says holding tanks should have at least a minimum 3/4" 
>> vent to have an effective bacterial reaction.  Now maybe in '98 this 
>> installation was acceptable but now ?  If my vent is only the 1/8" hole in a 
>> stanchion, maybe I should go back to using bucket.  Knowing our group, I'm sure 
>> someone out there can give me the poop on this fragrant issue (I know, pretty 
>> bad puns).
>> Mike Ott
>> 'Amanda Lu'
>> #508