Harwil is a 50+ year old manufacturer of Flow Switches, Level Switches, Pump Controls, Wireless Switch Controls, and Temperature Sensors. Harwil Flow Switches are used to detect or monitor water flow in both residential and commercial environments. Our Flow Switches detect flow, and then turn on a water treatment device such as a chemical feed pump, UV or ozone. We even have Hall Effect switches that can detect flow at single faucet in an apartment building. Our pump protection systems will shut down a pump if there is a flow problem, preventing damage to the pump. We offer a wide range of flow switches from heavy duty stainless steel models that are used by the US Navy; medium duty models that are water proof and can be buried or submersed; and low cost light duty switches for use by Original Equipment Manufacturers in their systems. Harwil flow and level switches are the standard in many industries. Harwil’s manufacturing facilities are located in Oxnard, Ventura County, California.