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Old 11-30-2013, 03:13 AM   #1
JesseW
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Default How to vent an upflush toilet

Hi, I just bought a Saniflo SaniAccess3 upflush toilet for my basement and after reading the instructions and doing some research on the internet, I'm still unclear on how to vent it. I don't have access to any vent lines from the floor above and I was hoping to not have to run a new pipe all the way up to the roof from the basement.

I do have access to the main 4" sewer line that goes all the way across the ceiling of the basement.
Is it acceptable to tap the toilet's 1" drainage pipe into the lower end of the 4" main sewer line and then connect my vent pipe further up the line of that same 4" sewer line?

Thanks for the help!



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Old 12-23-2013, 03:03 AM   #2
uplumb
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Re-read the instructions.. they clearly state in several spots NOT to tap into the bottom of an existing horizontal drain line..

With that system, you do not need to tap into an existing vent..

*** Please keep in mind that the system you are installing is a pressurized system.. if your connections and supports are not correctly fastened, you will have a large mess on your hands..



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Old 12-23-2013, 12:20 PM   #3
johnjh2o
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You must have a vent on the tank. When the tank fills it is displacing the air in the tank and the air needs some place to go or the tank will build pressure not allowing water to enter it.

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Old 12-26-2013, 12:44 PM   #4
JesseW
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Quote:
Originally Posted by uplumb View Post
Re-read the instructions.. they clearly state in several spots NOT to tap into the bottom of an existing horizontal drain line..

With that system, you do not need to tap into an existing vent..

*** Please keep in mind that the system you are installing is a pressurized system.. if your connections and supports are not correctly fastened, you will have a large mess on your hands..

I didn't actually mean that I would tie in to the "bottom" of the horizontal drain line. If I did that, all of the waste water would run down into the upflush toilet unit. What I meant is that I would tie in to the horizontal drain line at a low point in the horizontal run, but I would still use a wye connection that is pointing up and waste falls down into the horizontal line.

Then, further up on the horizontal run I was thinking of tying in the vent pipe since that horizontal run itself is vented. The only thing I don't like about that is the vent pipe will have to go down a bit at the end in order to tie into the top side of the main horizontal stack. I would think it would "work" though. No?
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