The most straightforward answer is no, toilet seats aren’t universal. There are two primary types that you can choose from, and the type you choose will be determined by the bowl of your toilet. Although a lot of toilet seats can be interchanged from one toilet to the next, this distinction between the two kinds of toilet seats available is a bit of an issue.

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There are two size toilets that are available in the United States. They are round and elongated. The toilet seats with elongation have a length of 18.5 inches long, while Round toilets have 16.5 inches in length. To determine what type of toilet seat you’ll need you need to measure from the top of the bowl all the way to in the middle hole for the seat post. 

As you’ll be able to discern from their name the toilets that are rounded have bowls that are almost perfect round and seats. In contrast the elongated toilets are more oval in form which means they are slightly longer that they’re wide. In simple terms round toilet seats won’t fit in an elongated toilet and the reverse is also true. 

With that said, if you are discussing the universality of elongated toilets or round toilet seats it is possible to claim that they are universal. In general, a round toilet seat will fit on all round toilets and the same could be said of elongated toilet seats. Both elongated and round toilet seats are of standard size which means that if you have an ordinary elongated toilet it should work with any standard elongated seat. The conclusion is that elongated seats have a tendency to be (usually) universal to long-lasting toilets. Round toilets are universal so they (virtually all) round toilets are concerned. However, all in all when we talk about all seat and toilet kinds, then they’re not universal.

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