Riello Metron R40 Fuel Pump (20031996)The Riello Mectron R40 fuel pump is designed for small and medium sized domestic oil burners. The pump can run off either a single or 2 pipe system, using the screw provided. The screw goes into the return port on the oil pump. This pump also comes with a drive coupling. Note, if the bottom of your oil tank is lower than the height of this oil pump, you require a tiger loop (sold separately in our shop).