Manufacturer Name: Dwyer Instruments Product Number: FS-2 OEM Part Number: FS-2 The Dwyer FS-2 Paddle Flow Switch is a durable, reliable flow switch designed for 1-inch NPT (National Pipe Thread) connections. It features a paddle mechanism that activates when liquid flow reaches a set point, making it ideal for monitoring and controlling pipeline flow. Constructed with corrosion-... https://www.partshnc.com/fs-2-dwyer-instruments-1-npt-paddle-flow-switch