适用于用在临时性水应用的消防栓上的防回流阀的更新改造。
Designed to retrofit backflow protection onto fire hydrants used for temporary water service.
建议的安装位置(如图所示)是将水调节阀连接到消防栓上，然后再通过软管连接到拖车上。
The recommended location (as shown) is to connect the water regulator to the hydrant, and then run the hose to the trailer rig.
美国瓦茨994HMB消防栓防回流阀仪表的设计和制造理念在于以 最少的维护提供 最 长的使用 寿命。
The Watts 994HMB fire hydrant backflow preventer meters are designed and manufactured to provide long-term service with minimal maintenance.
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