What is the minimum size of a fixture water supply pipe for a bidet?

The minimum size of a fixture water supply pipe for a bidet is typically 1/2". This is in accordance with common plumbing codes and standards, which recommend that smaller plumbing fixtures like bidets have sufficient flow without being overly constricted.

A diameter of 1/2" allows for adequate water volume and pressure to ensure proper operation of the fixture, providing a comfortable experience for the user. The sizing also helps ensure that there are no pressure drops that could lead to performance issues.

Using a smaller 3/8" pipe may not provide enough flow for effective operation, especially if there are multiple fixtures drawing water simultaneously. Additionally, larger pipe sizes, like 3/4" or 1", are typically used for main supply lines or larger fixtures, which would be unnecessary and inefficient for the specific needs of a bidet. Therefore, recognizing 1/2" as the standard minimum ensures both functionality and compliance with plumbing standards.