Holding Tank Breathing tube

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May 4, 2006
1
Catalina 30mkIII Richardson, TX
We have a presistent problem with the breathing tube hose being plugged. We have tried to clear the station which the hose connected too, to no avial. Does anyone have any ideas how to solve this problem. When the hose is plugged you can not flush the toilet. Don
 
Jun 2, 2004
87
Hunter 33_77-83 Montevallo Al
plugged from overfilling?

It may be that your vent gets plugged by overfilling the holding tank in which case a solution may be some kind of level indicator to make sure this does not happen.
 
Dec 2, 1997
8,961
- - LIttle Rock
I' m pretty sure he means stanchion...

Which means the boat has to be a Catalina...Catalina is the only builder I know of that runs the holding tank vent into a rail stanchion. The only air source is a tiny little slit in the base of the stanchion, and it's easy to clog...because when the boat heels, waste in the tank spills out the vent. What I'd do to cure the problem: 1. Get the vent out of the stanchion...install a vent thru-hull. 2. Move the vent fitting on the tank to the inboard side of the tank. This will prevent waste from spilling into the vent line when the boat is heeled. Meanwhile, about all you can do is keep the slit in the stanchion and the connection on the tank--both the fitting and that end of the vent hose--cleaned out with a screwdriver blade. You won't have to do it as often if you backflush the vent line (yes I know getting water into it through that little slit is a major challenge) every time you pump out and/or wash the boat.
 
Jun 6, 2006
6,990
currently boatless wishing Harrington Harbor North, MD
forward flush the vent hose

I feel your pain Don. I just took the vent hose off the holding tank and forced water through it. Be sure to close all the ports around the stanchion vent as "stuff" will go everywhere. Once you get her good and clean go topside and admire your mess. I had the same problem on my Catalina 30 and once I got the 10 years of accumulated "stuff" out of the vent, line and stanchion I never had any trouble out of it for over 3 years.
 
May 6, 2004
916
Hunter 37C Seattle
Don, if you had to "go"

and now you can't get the "go" gone, open the deck pumpout plug as an alternate vent. PS, open it slowly, trust me.
 
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