What is required when a bypass is installed around a RPZ?

When a bypass is installed around a Reduced Pressure Zone (RPZ) assembly, it is essential to install another RPZ on the bypass. This is because the primary function of an RPZ is to prevent backflow and protect the potable water supply from contamination. If there is a bypass without a backflow prevention device, it could create a pathway for contaminated water to enter the drinking water system, thus compromising water quality.

In systems where bypass lines are needed, having a second RPZ ensures that the same level of protection is maintained across the entire system. Each RPZ must function independently to effectively safeguard against potential backflow during maintenance or in the event of a failure in the primary assembly. This requirement not only aligns with safety standards but also with plumbing codes that emphasize the importance of maintaining adequate backflow prevention measures in all water supply configurations.