... fluid 3.We are the factory . 4.main material :brass 5.control type:paddle Water Flow Control Model :HFS-25 ,HFS- ... are not field addjustable .To Adjust Setting:1,Remove switch cover2,For higher flow rater-turn range adjusting screw clockwise3,For lower ... flow rater-turn range adjusting screw counter clockwise.4,Be sure flow swtich cover is replaced before leaving job. Water Paddle Flow Switch