... pipe , from top floor to the base room ,every floor need one water following indicator . How to working when the water in side pipe following ... rate exceed 15L/Min , the leaf of the water flowing switch will closed by impacted water . and output one fire singal . In ... -90SContact point AC 220 3a , Dc 24V1A , close and open on pair each we have thread , sadde type , welded type size ...