What was the primary contribution of the English plumber Thomas Crapper to the development of indoor plumbing?

Answer

Improving the design and standardization of sanitary fixtures like valves and traps

Thomas Crapper is often incorrectly credited with inventing indoor plumbing or the water pipe itself. In reality, his historical role was centered on the refinement, marketing, and standardization of sanitary components. He improved the functionality of waste traps, valves, and various fixtures, which made indoor plumbing systems significantly more reliable and accessible to a larger portion of the general public during the Victorian era.

What was the primary contribution of the English plumber Thomas Crapper to the development of indoor plumbing?
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