The VHS20M01171N41 paddlew flow switch from SIKA is a simple and economical solution to detect presence or absence of flow in a variety of liquid applications. The VHS20M01171N41 has a 3/4" NPT female process connection and a setpoint range of 1.8-2.4 GPM when set as normally open. The contact can be set to normally open or normally closed to suit your application. The VHS20M01171N41 provides a din connector with terminals for convenient wiring of the device as well.