The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.
The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.
带测试旋塞的关闭阀安装在防回流阀的进口一侧。
The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.
带测试旋塞的关闭阀安装在防回流阀的进口一侧。