What is the minimum size of the water supply piping for a sillcock?

The minimum size of the water supply piping for a sillcock is 3/4". This sizing is essential to ensure that the water supply has sufficient flow and pressure for the intended use of the sillcock, which is typically installed outdoors for garden hoses, irrigation, or other water-related tasks that require adequate water delivery.

Using a 3/4" pipe helps to minimize the friction loss that occurs as water travels through the piping. A larger diameter allows for greater water volume to flow without significant drops in pressure, which is especially important in applications where multiple water demands may be present, such as when connected to a sprinkler system or when using hoses simultaneously.

Smaller sizes such as 1/2", 3/8", or even 1" may not provide the necessary pressure or flow rates needed during peak usage, potentially leading to unsatisfactory performance of the sillcock. Therefore, 3/4" is established as the minimum standard to optimize functionality and efficiency for these outdoor water fixtures.