Description : SEN-HZ21WI DN15 1/2 Copper Water Flow Sensor Output Flow Sensor Switch. Specification : Material: Copper. Color: Gold. Type: 1/2(External Thread Diameter). Water quality requirement: =60?. Flow range: 1-30L/min. Maximum water pressure: 1.75MPa. Weight: approx 95g. Features : -Model:SEN-HZ21WI. -Made of copper material, environmental-friendly, really sturdy and durable. -Its maximum water pressure is 1.75MPa, the range of flow is from 1L/min to 30L/min. -Three wire connection: Red for positive pole, black for negative pole, yellow for pulse signal. -Lightweight, reasonable size,stable performance, low water pressure start,easy to install, safe to use. -Can be perfectly used for water heaters, water dispenser, water purifier, water vending machine, coffee maker, flow measurement device, water control machine and so on. Package Included : 1 x Water flow switch.