12 volt 500 GPH - 31 LPM. RULE model RM500B 1.8 amp @ 12V, 2.4 amp @ 13.6V Fuse size 4 amp. 500 US Gallons per hour - 31 Litres per minute at open fl ow 289 US Gallons per hour - 18 Litres per minute at 1 metre head Supplied with 1 x 20mm (3/4") threaded straight hose outlet