Excelvan Hand Primer All Fuels Car Boat Marine Pump Fuel Line Primer Bulb (12mm) The pump is temperature resistant up to -30----130  C With this hand pump you can prime the fuel for easier starts most commonly used on outboard or inboard boat engines Ideal for vehicles without ESP-priming, using 1 or 2 tank systems, as well as for the transfer of vegetable oil, diesel The hand primer is developed in four sizes. 6mm, 8mm,10mm,12mm