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Old 09-30-2012, 01:03 PM   #1
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Removing anti-siphon valve from a toilet tank


I am not a plumber or even in a plumbing-related field. But I do know how to change an anti-siphon valve.

The problem is two-fold. When I owned a condo n' replaced an anti-siphon valve 17yrs. ago

1. The bottom of the tank was completely smooth, no grooves in the tank.

2. Access to the back of the tank was not hampered by a 'floor-length' sink in close proximity.

Now, I have both these problems.

I had emptied the tank, when I noticed, unscrewing the plastic bolt is almost impossible. The back of the tank, where the anti-siphon valve comes through the bottom of the tank, is not flush, it is grooved. Meaning it is practically in-set. Making access even worse. Sure I could try to use a pair of pliers, but because of the tight position of the tank to the sink, I can't get the leverage I need to unscrew it. The homeowner(a relative) broke the valve off inside the tank, but the bolt is still on very tight. Their braking the valve off is no problem. The problem is still on the underside of the tank. I was going to try to drill a crack in the plastic, but have decided against that. Since it could damage the tank.

This toilet has been out of commission for several days. I need an idea of how to get the bolt off so, I can take off the parts to that valve off, then put the new valve inside the tank.


Last edited by Chris0516; 09-30-2012 at 03:12 PM.
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Old 09-30-2012, 01:37 PM   #2
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Removing anti-siphon valve from a toilet tank


Ayuh,.... Take the Whole tank off, 'n flip it over to get at it...

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Old 09-30-2012, 01:49 PM   #3
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Removing anti-siphon valve from a toilet tank


Or remove the whole toilet if it's eazer to get to. Just going to have to replace the wax ring.
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Old 09-30-2012, 02:38 PM   #4
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Removing anti-siphon valve from a toilet tank


Quote:
Originally Posted by Bondo View Post
Ayuh,.... Take the Whole tank off, 'n flip it over to get at it...
The tank and toilet are molded together.

Quote:
Originally Posted by joecaption View Post
Or remove the whole toilet if it's eazer to get to. Just going to have to replace the wax ring.
That may have to happen. Because the toilet and the tank are not two individual parts. The problem toilet, and the toilet in the upstairs bathroom, are the same design. The same thing will eventually happen to the upstairs toilet, which is in a bathroom smaller than a walk-in closet.
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Old 09-30-2012, 03:34 PM   #5
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Removing anti-siphon valve from a toilet tank


Sounds like the poster is trying to change the flush valve. What he should know is the anti-siphon is part of the fill valve.
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Old 09-30-2012, 04:33 PM   #6
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Removing anti-siphon valve from a toilet tank


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Sounds like the poster is trying to change the flush valve. What he should know is the anti-siphon is part of the fill valve.
That is exactly what I have been trying do. But the underside of the toilet tank, where the valve comes through the bottom of the tank, is recessed, like a manhole cover is recessed in the road. That is why it is hard to get at.
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Old 09-30-2012, 04:50 PM   #7
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Removing anti-siphon valve from a toilet tank


Try a basin wrench.

I usually cut them off with an oscillating saw if I have trouble.
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Old 09-30-2012, 05:09 PM   #8
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Removing anti-siphon valve from a toilet tank


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Originally Posted by rjniles View Post
Try a basin wrench.

I usually cut them off with an oscillating saw if I have trouble.
I tried a basin wrench and could not get the leverage I needed. I will try an oscillating saw.

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