Installation remarks: 1. If the pump does not have a check valve, then a check valve must be installed before the pressure, in this case the pump can On / off, often ore. 2.If you use the faucet water, if the pump is on / off time to time, please put the H valve to a larger valve. 3.If the pump keep running with stop, please lower the H valve, to the other hand, if th epump is not working, please set the L valve higher. Item Type: Switches : No Switch Type: Pressure Switch Features: Digital Pressure Switch Relay capacity: 220 V AC 10A. Fluid Temperature: 80 degrees Waterproof: IP466 Working pressure range: 0-10 bar, matching with all pumps Output signal: active output, to provide pump 220V, start the pump down 1.5KW directly. : Can be used continuously for more than 20 million times. Socket type: three flat pins male Wiring: 3 wires White: Positive Black: Negatives Green & yellow: ground Properties: Print transimitter inside, stable and accurate. Switch the pump during water shortage and on with water. Micro- computer process chip, safe and intelligent control. One-click on set-up on / off limit. colour:yellow Material:plastic size:112*52*85mm Cable length: the long one is 88 cm the short is 35 cm Package Contents: 1 x Pressure Switch 1 x English user maual Note: 1. (IMPORTANT) Professional Installation Is Highly Recommend! 2. Please check the size measurement chart carefully before payment. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.