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Old 08-06-2012, 12:57 AM   #1
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Toilet leak between toilet bowl and tank - ONLY when flushing


I replaced the wax run in my toilet and wen I put it back together and turned on the water, nothing was leaking (from the base or from the tank bolts). I flushed it and water came POURING from the between the tank and bowl. I've replaced the tank gasket and still no luck. When I semi-empty the water out (after turning off the water), and I press the flushing lever to open the flapper and let some of the remaining water in the tank out, most of it goes right into the bowl.


So it appears that it's when there is a mostly ful tank is when The water pours. But I can't figure out how it's escaping in the pat to the bowl. Any thoughts on what to look at???? (I'm wet and desperate). Thx!!

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Old 08-06-2012, 06:52 AM   #2
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Toilet leak between toilet bowl and tank - ONLY when flushing


Wrong or faulty tank/bowl gasket.

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Old 08-06-2012, 01:30 PM   #3
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Toilet leak between toilet bowl and tank - ONLY when flushing


I just bought a new gasket so I assume it's not faulty. As for 'wrong', isn't this how it is supposed to fit?
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Old 08-06-2012, 03:37 PM   #4
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Toilet leak between toilet bowl and tank - ONLY when flushing


Wrong gasket.

You need one that has the hexagon 'cutout' in it. Look at where the OLD one was.... you can still see the ring where it touched the tank.

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Old 08-06-2012, 06:04 PM   #5
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Toilet leak between toilet bowl and tank - ONLY when flushing


Interesting though ... I've never changed the gasket. The house was new when I bought it... And the original was like the one I showed in the pic...


I didn't see a hex gasket when I was at Lowes.. Will have to look around
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Old 08-06-2012, 07:40 PM   #6
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Toilet leak between toilet bowl and tank - ONLY when flushing


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Originally Posted by Mike.neace View Post
Interesting though ... I've never changed the gasket. The house was new when I bought it... And the original was like the one I showed in the pic...


I didn't see a hex gasket when I was at Lowes.. Will have to look around
you need a thicker gasket ..if you can't find a hex...the thicker one should still work....ben sr
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Old 08-06-2012, 08:05 PM   #7
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Toilet leak between toilet bowl and tank - ONLY when flushing


...unless the toilet is a flushmate/crane pressure assisted.... I tried the thicker gasket when my old one finally bit the dust, and it did NOT work, I tried every one they had at the BB stores.... I had to get the "special" hex one from a REAL PS store.....

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Old 08-07-2012, 08:54 AM   #8
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Toilet leak between toilet bowl and tank - ONLY when flushing


It is also posible that those wing nuts on the bowl bolts are keeping the tank from compressing down on the gasket
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Old 08-07-2012, 09:03 AM   #9
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Toilet leak between toilet bowl and tank - ONLY when flushing


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Originally Posted by danpik
It is also posible that those wing nuts on the bowl bolts are keeping the tank from compressing down on the gasket
When I took the toilet apart those "extra" wing nuts were there between the tank and bowl. I've put it back together both ways and still get the same thing.
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Old 08-07-2012, 01:42 PM   #10
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Toilet leak between toilet bowl and tank - ONLY when flushing


Do most plumbing supply stores have the gaskets that cover the hex fitting? I've been to a couple and they didn't have them.
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Old 11-11-2014, 01:28 PM   #11
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Toilet leak between toilet bowl and tank - ONLY when flushing


I just wanted to say thanks for this thread. I have a similar leak and it looks like I need a new spud gasket. Now I know the right kind to get!

And I think danpik is right-on about those long plastic nuts between the tank and bowl being too thick for that space. They look like the plastic nuts to hold the seat on.

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