26mm 3/4inch PT Thread Water Flow Sensor Switch for 120W Pumps Overview A compact inline water flow sensor switch designed to control small pumps up to 120W. Fits 3/4inch PT threaded fittings (26mm) and activates an electrical circuit in response to water flow, enabling automatic pump control without complex wiring. Key benefits Automatic pump control: Detects water flow and switches the circuit, allowing pumps to run only when flow is present. Simple compatibility: Designed for 3/4inch PT threaded plumbing (26mm) for easy inline installation with common fittings. Saves time on setup: Threaded connector simplifies installation into existing water lines without special adapters. Compact and unobtrusive: Small profile fits tight spaces and inline positions near pumps or valves. Features and specifications Thread size: 26mm, compatible with 3/4inch PT threaded fittings. Function: Water flow sensor switch that closes or opens a circuit based on detected flow. Pump rating: Suitable for controlling pumps rated up to 120W. Installation: Inline threaded connector for direct integration into water lines. Electrical interface: Standard switch output for connection to pump controllers or relays. Why customers choose this part Practical control: Makes it easy to add flowbased switching to pump systems where automatic on/off based on actual flow is needed. Versatile use: Works with many small pump applications that use 3/4inch PT thread plumbing and fall within the 120W power range. Low complexity: No complex programming or electronics required; functions as a straightforward mechanical/electrical switch triggered by flow. Typical applications Domestic water booster pumps: Enable pumps to start only when water is drawn, adding basic automatic control for sinks, showers, or pressure systems. Recreational vehicles and boats: Integrate into RV or marine freshwater lines to control small transfer pumps and reduce manual switching. Small irrigation and garden systems: Use in drip or micro irrigation setups to activate pumps when valves open or outlets are in use. Installation tips Install inline in the flow direction indicated by the plumbing layout. Use appropriate thread sealant compatible with potable water systems if required by local codes. Verify pump power rating does not exceed 120W before wiring to the switch output. Test the switch operation with the pump disconnected from loads before finalizing connections. What is included One 26mm 3/4inch PT thread water flow sensor switch for use with pumps up to 120W. This flow sensor switch provides a straightforward mechanical solution for adding flowbased control to small pump systems, with direct compatibility for 3/4inch PT threaded plumbing and a power rating suitable for many domestic and mobile applications.