Trapped water less than 5 gallons requires what size auxiliary drain?

An auxiliary drain is designed to remove trapped water from a system, and the size of the drain must be appropriate for the volume of water it is intended to handle. For trapped water amounts less than 5 gallons, a ½-inch nipple, cap, or plug is sufficient. This size is effective because it allows for proper drainage without being overly large, which could cause unnecessary flow issues or complications in the system.

Using a nipple of this size ensures that the auxiliary drain can remove smaller quantities of trapped water effectively, maintaining the system’s integrity and preventing potential damage or malfunction. The ½-inch size strikes a practical balance between functionality and efficiency, minimizing the risk of clogging while providing adequate drainage capability for specific low-volume situations.

In comparison, larger options would not be necessary, as they are typically reserved for larger volumes of trapped water where more significant drainage capacity is required.