The automatic LoPro operates in multiple modes – NO float switch is required. High or low water sensing mode – the pump can be set to start operation at either 33mm or 50mm bilge water height. Electronic automatic timer mode – The pump can be set to automatically check for water every 2 1/2 minutes – if water is present it will continue to run and pump bilge water. This feature is very handy – however if you leave the boat unattended on a mooring it may run down the battery over time, if you don?t have solar panels or a wind generator etc to constantly charge the battery – in this case set the pump only to high or low mode. Includes pump test mode. Includes manual over-ride 3rd wire – requires a Rule 3 way panel switch RWB23 or 107 to operate this feature. 12 volt 4 amp use a 7.5 amp fuse. 12 volt DC only – DO NOT run direct off a 240v-12v transformer. Small enough to fit into tight spaces in the bilge – yet they pack real pumping power at 900 gallons per hour – 3,400 litres per hour – 57 litres per minute. This pump includes numerous features for ease of installation, ease of use and multiple options for use. Up to 900 GPH – 3,400 LPH – 57 litres per minute at open flow. Up to 634 GPH – 2,400 LPH – 40 litres per minute at 1 metre head. Up to 418 GPH – 1,582 LPH – 26 litres per minute at 2 metre head. Maximum head height – 4 metres = 0 flow. Compact 60mm high (port to the side) 60mm wide (port upright). Length – 195mm RWB5158 Std Model – 245mm RWB5159 Auto. Fully submersible – horizontal or vertical mounting. Ignition protected – won?t create a spark. Thermal cut-out to prevent overheating if run dry. Silicone blocked tinned 16 gauge wiring. Rotating discharge body swivels 180 deg for ease of installation. Threaded discharge nozzle with multiple hose ports included as standard in the package – 4 different hose ports provided – 1 each 20mm, 25mm & 28mm straight & 1 x 20mm 90 deg elbow. Straight discharge ports include a nitride non-return check valve. (for use on straight ports only – not to be used on 90 deg port) 3 year limited warranty.