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Author Topic: Holding Tank Second Vent  (Read 15824 times)

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frankya

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Re: Holding Tank Second Vent
« Reply #30 on: September 21, 2020, 08:12:47 AM »

Lots posted over the years, here and elsewhere,  about what a second vent does, and why it is often needed.
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KWKloeber

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Re: Holding Tank Second Vent
« Reply #31 on: September 21, 2020, 08:51:28 AM »

Mike

I'm intertested -- which vent and where is it located that you were getting the back flow?

-k
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
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WBev

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Re: Holding Tank Second Vent
« Reply #32 on: September 21, 2020, 01:55:27 PM »

I have experienced the same issue, and having researched it on this (incredible) web site, plan to place the second vent this winter. In my case, a water lock occurred in the vent line, leaving no where for the gas fumes to go, expanding the tank and pushing water back toward the bowl.  My vent had been relocated to the deck, next to the pump out fitting, using a standard vent mushroom like we have for the fresh water tank.

Interestingly, my neighbor's Sea Ray powerboat suffered the same consequence caused by the high velocity flow of water down the side when under way. 
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Wobegon II
1992 C-34 MK 1.5
 #1211,  Wing/Tall Rig
Magothy River, MD
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