How In The World Do I Change The Fill Valve In This Toto CST416M? - Plumbing - DIY Home Improvement | DIYChatroom
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Old 03-05-2015, 07:07 PM   #1
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How in the world do I change the fill valve in this Toto CST416M?


I have a toilet. There are many like it, but this one is mine. The fill valve is broken (the plastic clasps in the base have snapped). I know how to change the fill valve in a normal toilet, but this toilet has decided to hide everything...

I can't get my hands or a tool on the water supply nut. I can't get my hands or a tool on the toilet tank nuts in order to separate the pieces. I'm happy to call a plumber, but I don't want her to come over and tell me the toilet has to come out to replace the fill valve. I'd sooner replace the entire toilet.

Is there some trick I don't know about?
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Old 03-05-2015, 07:10 PM   #2
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Apparently I need "at least 1 post" to post links to images...
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Old 03-05-2015, 07:10 PM   #3
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Old 03-05-2015, 07:57 PM   #4
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I finally found some instructions that specifies removal of the tank to gain access to the water supply nut. I guess I'll try harder to access the tank nuts.

This is a bad design tradeoff.
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Old 03-05-2015, 08:46 PM   #5
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Yea, I'm not familiar with that model. I Couldn't give you any advice other than follow those instructions you got from the manufacturer or call them directly for assistance.

Maybe others have experience with it and can give you more advice/suggestions.
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Old 03-05-2015, 08:50 PM   #6
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Quote:
Originally Posted by Tremelune View Post
I finally found some instructions that specifies removal of the tank to gain access to the water supply nut. I guess I'll try harder to access the tank nuts.

This is a bad design tradeoff.
Page #5 of your link explains how.....
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Old 03-05-2015, 09:04 PM   #7
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I have an additional complication in that my toilet is about 1" from the wall. I just can't get at the nuts in the back without some special tool.
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Old 03-05-2015, 09:20 PM   #8
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I have an additional complication in that my toilet is about 1" from the wall. I just can't get at the nuts in the back without some special tool.
If you look inside the tank do you see some nuts?
I've only installed one of these and it was a while back so my memory of it is not good.

Look at illustration #4 and steps 9, 10
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Old 03-05-2015, 09:24 PM   #9
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I agree, not a very good design. Seems like there has gotta be a way. Hopefully you won't have to pull the whole toilet just to fix it.

Last edited by jmon; 03-05-2015 at 09:54 PM.
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Old 03-05-2015, 10:12 PM   #10
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There are two bolts. The top has slots for a large screwdriver and the nuts are accessed from recesses in the rear of the toilet seat base.

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Old 03-06-2015, 05:51 AM   #11
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Looks like your supposed to unfasten it from inside the tank.
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