in a conveying pump having a cylinder introducible into a reservoir and having a pump piston , whereby the conveyed medium is supplied via an ascending line to a discharge line , an ascending line formed of two sections adjustable relative to one another is provided . the ascending line can be locked at different heights to vary the length of the ascending line so that the conveying pump can be used for reservoirs of different heights without deteriorating the conveying capacity of the pump . this adaptation can be performed easily and quickly . in addition , the conveying pump can be taken apart and easily cleaned , and component parts can be easily replaced .