The series V8 Flotect flow switch is ideal for swimming pool applications because all the wetted parts are plastic or 316 stainless steel, and the switch is magnetic. There are no seals to fail. It can be used in a pipe from 1″ to 6″ in diameter, the vane is marked and can be trimmed for each pipe size. The body is threaded with 1-inch MNPT. The electrical rating is 5 amps at 125/250 VAC. It is 3 wire so can be used as normally open or normally closed. A great switch at a great price.