A pump for compressing and/or transporting a fluid, having a) a pump housing, comprising i) a first housing part, having - a first outer wall, - a first fluid port in the first outer wall, and - a first face side, and ii) a second housing part, having - a second outer wall, - a second fluid port in the second outer wall, wherein the second fluid port is in flow connection with the first fluid port, and - a second face side, b) a pump motor, i) which is arranged in the first housing part, c) a fluid mover for transporting the fluid, wherein the fluid mover is i) drivable by the pump motor, and ii) in the second housing part, and d) a housing part connecting device for connecting the first housing part and the second housing part with each other, so that the first face side and the second face side face each other, wherein the housing part connecting device is adjustable between a connecting position and a release position, wherein i) in the connecting position, the first housing part and the second housing part are - fixed in an axial manner with each other, and - fixed in a rotatably fixed manner with each other, and ii) in the release position, the first housing part and the second housing part are - rotatable pivotably relative to each other and the first fluid port and the second fluid port are adjustable relative to each other, and - limited in relative axial movement to each other. a) a pump housing, comprising i) a first housing part, having - a first outer wall, - a first fluid port in the first outer wall, and - a first face side, and ii) a second housing part, having - a second outer wall, - a second fluid port in the second outer wall, wherein the second fluid port is in flow connection with the first fluid port, and - a second face side, i) a first housing part, having - a first outer wall, - a first fluid port in the first outer wall, and - a first face side, and - a first outer wall, - a first fluid port in the first outer wall, and - a first face side, and ii) a second housing part, having - a second outer wall, - a second fluid port in the second outer wall, wherein the second fluid port is in flow connection with the first fluid port, and - a second face side, - a second outer wall, - a second fluid port in the second outer wall, wherein the second fluid port is in flow connection with the first fluid port, and - a second face side, b) a pump motor, i) which is arranged in the first housing part, i) which is arranged in the first housing part, c) a fluid mover for transporting the fluid, wherein the fluid mover is i) drivable by the pump motor, and ii) in the second housing part, and i) drivable by the pump motor, and ii) in the second housing part, and d) a housing part connecting device for connecting the first housing part and the second housing part with each other, so that the first face side and the second face side face each other, i) in the connecting position, the first housing part and the second housing part are - fixed in an axial manner with each other, and - fixed in a rotatably fixed manner with each other, and - fixed in an axial manner with each other, and - fixed in a rotatably fixed manner with each other, and ii) in the release position, the first housing part and the second housing part are - rotatable pivotably relative to each other and the first fluid port and the second fluid port are adjustable relative to each other, and - limited in relative axial movement to each other. - rotatable pivotably relative to each other and the first fluid port and the second fluid port are adjustable relative to each other, and - limited in relative axial movement to each other.