... -25 ,HFS-20, HFS-15 2.Be used in water or any fluid 3.We are the factory . 4 ... .main material :brass 5.control type:paddle Water Flow Control Model :HFS-25 ,HFS-20,HFS-15Application ... Flow control used in liquid flow lines carrying water or any fluid ,not harmful to ... are not field addjustable .To Adjust Setting:1,Remove switch cover2,For higher flow rater-turn range adjusting ...