Installation remarks:1. If the pump does not have a check valve, then a check valve must be installed becompatible withe the pressure, in this case the pump canOn / 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: SwitchesWarranty: NoSwitch Type: Pressure SwitchFeatures: Digital Pressure SwitchRelay capacity: 220 V AC 10A.Fluid Temperature: 80 degreesWaterproof: IP466Working pressure range: 0-10 bar, matching with all pumpsOutput signal: active output, to provide pump 220V, start the pump down 1.5KW directly.Long life: Can be used continuously compatible with more than 20 million times.Socket type: International three flat pins maleWiring: 3 wiresWhite: PositiveBlack: NegativesGreen yellow: groundProperties: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:yellowMaterial:plasticsize:112*52*85mmCable length: the long one is 88 cmthe short is 35 cmPackage Contents:1 x Pressure Switch1 x English user maualNote:1. (IMPORTANT) Professional Installation Is Highly Recommend 2. Please check the size measurement chart carefully becompatible withe payment.Only the above package content, other products are not included.Note: Light shooting 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.