series 957, 957n, 957z reduced pressure zone assemblies provide protection to the potable water system from contamination in accordance with national plumbing codes.
系列957,957n,957z减压区总成按照美国国家管道规程为防止饮用水系统受到污染提供保护。
the potable water system consists of a water tank, quantity indication, pressurization components, and distribution tubing.
饮用水系统由一个水箱、流量指示器、增压组件及分配管道组成。
the watts 994hmb fire hydrant reduced pressure backflow preventer meter is designed to protect the potable water system by preventing backflow through the fire hydrant.