This special hand priming pump for heating oil is used for commissioning and after faults in the suction line system of oil-fired heating systems. Oil suction pump with non-return/venting valve and a very high suction capacity per suction stroke, with rubber cone for oil lines of 8-18 mm or for suction directly at the oil filter. Suction hose available separately. Is required by craft businesses that are approved in accordance with WHG § 19 i.