Why Are Public Toilet Seats U-Shaped?

Plumbing codes require u-shaped toilets for hygienic reasons.

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Here's The Reason There's A 'U Gap' On Public Toilet Seats

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Why Are Public Toilet Seats U-Shaped?

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Why U.S. Public Toilet Seats Are U-Shaped - Your Mileage May Vary

Reason behind why some public toilets have U-shaped seats

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9 Perfectly Good Reasons Why Public Toilet Seats Are U-Shaped