... 20, HFS-15 2.Be used in water or any fluid 3.We are the factory ... Water Flow Control Model :HFS-25 ,HFS-20,HFS-15Application Flow control used in liquid flow lines carrying water ... 5pipe diameter on each side of the flow swhtch .AdjustmentNote :sealed adjustments are not ... flow rater-turn range adjusting screw counter clockwise.4,Be sure flow swtich cover is replaced before leaving job. Water Pump Flow ...