One key consideration in designing a building plumbing system that maintains acceptable pressure at fixtures is the pressure available at the location where water enters the building. Pressures that are either too high or too low at the point of entry can be caused by several factors.

One of the most common applications is as a point-of-entry pressure regulator on the cold-water service pipe supplying a building. This section describes preferred locations, maintenance, and other troubleshooting scenarios.

This section will show and describe the components referenced in the other sections, as well as the formula for calculating pressure drop in copper tubing.