Where are pressure-type vacuum breakers typically installed?

Pressure-type vacuum breakers are specifically designed to prevent backflow in potable water systems, ensuring that harmful contaminants do not enter the drinking water supply. Their primary function is to protect potable water openings from the possibility of backsiphonage, which can occur when there is a sudden drop in water pressure.

By installing these devices at points where potable water is accessed, they serve as a crucial safeguard. Their installation helps maintain the integrity of the water system by providing an air gap that prevents any negative pressure from drawing contaminated water back into the clean water supply.

In contrast, while water source points and outdoor hose bibs might require backflow prevention measures, they are not the specific locations where pressure-type vacuum breakers are typically used. Additionally, drainage systems do not use vacuum breakers, as their function is entirely unrelated to backflow prevention in regard to potable water. Thus, the installation of pressure-type vacuum breakers is specifically oriented towards protecting potable water openings, aligning with their intended application per the International Residential Code standards.