A pump, comprising: an accommodating housing which forms a cup-shaped accommodating space comprising an end-facing wall and a circumferential wall; and a pump insert which is inserted into the accommodating space as a unit which can be handled separately from the accommodating housing via an opening in the accommodating housing which lies opposite the end-facing wall, wherein the pump insert comprises: - a rotor and a pump shaft; - a first housing part and a second housing part, between which the rotor is arranged such that it can be rotated about a rotational axis and relative to the first and second housing part (2, 3), wherein the pump shaft is non-rotationally connected to the rotor and mounted such that it can be rotated in the first housing part and in a blind cavity of the second housing part; and - a stroke ring which surrounds the rotor and is arranged between the first housing part and the second housing part, wherein a first delivery chamber which is connected to a first pressure space via a first outlet channel of the second housing part, and a second delivery chamber which is connected to a second pressure space via a second outlet channel of the second housing part, are formed radially between the stroke ring and the rotor, and a second seal, in particular a sealing ring, which is arranged between the accommodating housing and the second housing part seals off the first pressure space, which is formed between the end-facing wall and the second housing part, in relation to a suction space which is formed between the circumferential wall and the stroke ring, and a first seal which is arranged between the first housing part and the accommodating housing, in particular the circumferential wall of the accommodating housing, for example seals off the suction space with respect to the outside or with respect to the opening in the accommodating housing, wherein the suction space is formed between the first seal and the second seal, and a sealing element which is arranged between the second housing part and the end-facing wall of the accommodating housing annularly surrounds the second pressure space. an accommodating housing which forms a cup-shaped accommodating space comprising an end-facing wall and a circumferential wall; and a pump insert which is inserted into the accommodating space as a unit which can be handled separately from the accommodating housing via an opening in the accommodating housing which lies opposite the end-facing wall, wherein the pump insert comprises: - a rotor and a pump shaft; - a first housing part and a second housing part, between which the rotor is arranged such that it can be rotated about a rotational axis and relative to the first and second housing part (2, 3), wherein the pump shaft is non-rotationally connected to the rotor and mounted such that it can be rotated in the first housing part and in a blind cavity of the second housing part; and - a stroke ring which surrounds the rotor and is arranged between the first housing part and the second housing part, - a rotor and a pump shaft; - a first housing part and a second housing part, between which the rotor is arranged such that it can be rotated about a rotational axis and relative to the first and second housing part (2, 3), wherein the pump shaft is non-rotationally connected to the rotor and mounted such that it can be rotated in the first housing part and in a blind cavity of the second housing part; and - a stroke ring which surrounds the rotor and is arranged between the first housing part and the second housing part, wherein a first delivery chamber which is connected to a first pressure space via a first outlet channel of the second housing part, and a second delivery chamber which is connected to a second pressure space via a second outlet channel of the second housing part, are formed radially between the stroke ring and the rotor, and a second seal, in particular a sealing ring, which is arranged between the accommodating housing and the second housing part seals off the first pressure space, which is formed between the end-facing wall and the second housing part, in relation to a suction space which is formed between the circumferential wall and the stroke ring, and a first seal which is arranged between the first housing part and the accommodating housing, in particular the circumferential wall of the accommodating housing, for example seals off the suction space with respect to the outside or with respect to the opening in the accommodating housing, wherein the suction space is formed between the first seal and the second seal, and a sealing element which is arranged between the second housing part and the end-facing wall of the accommodating housing annularly surrounds the second pressure space.