Hydrolevel FS200 1" Liquid Flow Switch for 1'-6" Pipe• Universal Design – Replaces switches by McDonnell & Miller, Taco, Penn and others • Suitable for 1" to 6" Pipe Diameters • Adjustable Sensitivity •Includes Four Heavy Duty Stainless Steel Paddles https://hydrolevel.com/wp-content/uploads/2018/12/Model-FS200-Instructions-web.pdf ...