The Rule SuperSwitch is designed for the toughest applications and features a larger float for increased buoyancy and a removable base for easy servicing and installation. This tried and tested Float Switch is capable of handling bilge pumps drawing up to 20 Amps. Features For automatic on/off bilge pump control Marine quality corrosion free wiring . Switch design prevents rapid on/off cycling. Environmetally friendly - New Mercury free model Removeable base for cleaning Specification Voltage:For 12 -24v DC Max.Amps: Suitable for pumps drawing up to 20 Amps Dimensions: 105mm long, 40mm wide, 110mm high (at max.lift) Mounting Position and Installation The Rule Float Switch should be mounted at the lowest point in the bilges or at the height required to control the water level. Ensure the switch is upright and that there is sufficient clearance for the float when in the fully up position. It should be mounted fore and aft with the hinged end pointing towards the bow. This helps prevent rapid on/off cycling if the boat rolls sideways Now backed by a 5 year warranty, the non-mercury SuperSwitch is designed for the toughest applications. Design includes marine grade 14 gauge "blocked wire", larger float for increased buoyancy, removable base for easy servicing and a snap switch design capable of handling pumps drawing up to 20 Amps. A standard bilge pump operates by a control switch that senses water and activates the pump. Rule’s Float Switches offer outstanding performance. We use extra-large float chambers for increased buoyancy and detachable mounting bases that make them easier to install and remove for cleaning and inspection. All models are suitable for pumps that draw up to 20 amps, except the Model 35 Rule-A-Matic, which is suitable up to 14 amps. Model Number: 37AModel Name: Super SwitchVolts(DC): 12-24-32