In which systems should saddle hubs or fittings not be installed?

Saddle hubs or fittings are typically used in plumbing to connect smaller pipes to larger ones without cutting into the main pipe, which is especially useful in specific applications. However, their installation is not appropriate in drainage, venting, or water systems because these systems require secure, watertight connections that can handle pressure and prevent leaks effectively. The integrity of these systems is crucial for safe and efficient operation, as leaks in drainage and water systems can cause significant problems and code violations.

In contrast, other systems like heating, electrical conduit, and gas systems have their own specific standards and types of fittings that are designed to ensure safety and compliance with building codes. For instance, heating systems may have specific requirements for joints and fittings that can withstand thermal expansion and pressure changes, while gas systems require fittings that are designed to prevent leaks and ensure safe distribution of gas.