Installed at the residential fire sprinkler service connection to the main, Series 07S Dual Check Backflow Preventers protect the water supply against polluted water being siphoned back from the sprinkler system.

• 安装在住宅消防喷淋头与主管道连接处，系列07S双止回防回流阀保护水供应系统不会受到从喷淋系统中虹吸回来的污染水的污染。