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Groove Type Pre Action Deluge Alarm Valve 2-1/2'' 3'' 4'' 5'' 6'' 8'', Find Details and Price about Pre Action Valve Preaction Alarm Valve from Groove Type Pre Action Deluge Alarm Valve 2-1/2'' 3'' 4'' 5'' 6'' 8'' - Fujian Xinlongdu Fire Protection Technology Co., Ltd.