When did they change toilet tank bolt patterns?


Old 07-12-18, 06:50 AM
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When did they change toilet tank bolt patterns?

I have to replace a cracked toilet tank. 'Ordered one online from a well known building supply chain.

When I opened the box, I discovered two mounting bolt holes. My toidy - and all the ones I've ever seen - have three bolt holes. I double checked the description on the website. It never mentions the number of holes.

What am I missing? And how do I prevent this from happening again?
Old 07-12-18, 08:46 AM
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I've only seen three bolts on really, really old toilets. Every new toilet I've installed in the past 30 years has had two bolts. If your toilet is old I would replace the entire thing. All modern tanks are water saving and may not provide a good flush with an old bowl.

Also, if ordering just a tank you need to make sure you get the correct tank for your bowl. There is no standard so the tank from one model may not fit on a different model bowl.
Old 07-13-18, 01:00 AM
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I think some Kohler toilets have 3-bolts tanks. A generic tank will only work on a generic toilet (sometimes).

Old 07-13-18, 04:59 AM
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I avoid those toilets that use only two bolt tank to bowl. Often just can't get them to seal. Never had a problem with the three bolt pattern.

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