How many shut-off valves must each water closet have?

Each water closet is required to have one shut-off valve to control the flow of water to the toilet. This valve allows for the water supply to be turned off during maintenance or repairs, ensuring that plumbing work can be done safely and without flooding.

Having one dedicated shut-off valve simplifies the plumbing system and makes it easier for users to perform basic maintenance. While additional valves might be used in more complex plumbing systems or for specific applications, the standard requirement for each water closet is a single shut-off valve. This design promotes efficiency and accessibility in managing the water supply to the toilet.