Side channel machine arrangement for conveying a fluid, in particular a gascous fluid, comprising a) a side channel machine i) with a housing, ii) with side channels arranged in the housing, iii) with fluid inlet openings, which are provided in the housing and have a flow connection to the side channels to introduce a fluid to be conveyed into the side channels, iv) with at least one fluid outlet, which is provided on the housing and has a flow connection to the side channels for discharging the fluid from the side channels, and v) with an impeller, which is mounted so as to be rotatably driveable in the housing around a centre axis, to convey the fluid in the side channels, and b) a fluid connection device for connecting the side channel machine to a fluid supply line, comprising i) a first fluid connection mechanism, which - is provided on the housing, - has a first limiting wall limiting a fluid connection space, and - has a flow connection to the fluid inlet openings, and ii) a second fluid connection mechanism (4; 4a), which - has a fluid inlet piece (29; 29a) for connection to the fluid supply line, - has a fluid-tight connection to the first fluid connection mechanism, and - with the first fluid connection mechanism, limits the fluid connection space, iii) wherein the first fluid connection mechanism and the second fluid connection mechanism (4; a) have a positive connection to one another, and characterised in that c) the first fluid connection mechanism has a second limiting wall, which limits the fluid connection space and runs opposing the first limiting wall, d) the first fluid connection mechanism is laterally open to the outside on both sides between the first limiting wall and the second limiting wall, and e) the second fluid connection mechanism (4; 4a) - is clamp-like and - closes the first fluid connection mechanism by its side limiting walls laterally to the outside in the direction of the centre axis. a) a side channel machine i) with a housing, ii) with side channels arranged in the housing, iii) with fluid inlet openings, which are provided in the housing and have a flow connection to the side channels to introduce a fluid to be conveyed into the side channels, iv) with at least one fluid outlet, which is provided on the housing and has a flow connection to the side channels for discharging the fluid from the side channels, and v) with an impeller, which is mounted so as to be rotatably driveable in the housing around a centre axis, to convey the fluid in the side channels, and i) with a housing, ii) with side channels arranged in the housing, iii) with fluid inlet openings, which are provided in the housing and have a flow connection to the side channels to introduce a fluid to be conveyed into the side channels, iv) with at least one fluid outlet, which is provided on the housing and has a flow connection to the side channels for discharging the fluid from the side channels, and v) with an impeller, which is mounted so as to be rotatably driveable in the housing around a centre axis, to convey the fluid in the side channels, and b) a fluid connection device for connecting the side channel machine to a fluid supply line, comprising i) a first fluid connection mechanism, which - is provided on the housing, - has a first limiting wall limiting a fluid connection space, and - has a flow connection to the fluid inlet openings, and ii) a second fluid connection mechanism (4; 4a), which - has a fluid inlet piece (29; 29a) for connection to the fluid supply line, - has a fluid-tight connection to the first fluid connection mechanism, and - with the first fluid connection mechanism, limits the fluid connection space, iii) wherein the first fluid connection mechanism and the second fluid connection mechanism (4; a) have a positive connection to one another, and characterised in that i) a first fluid connection mechanism, which - is provided on the housing, - has a first limiting wall limiting a fluid connection space, and - has a flow connection to the fluid inlet openings, and - is provided on the housing, - has a first limiting wall limiting a fluid connection space, and - has a flow connection to the fluid inlet openings, and ii) a second fluid connection mechanism (4; 4a), which - has a fluid inlet piece (29; 29a) for connection to the fluid supply line, - has a fluid-tight connection to the first fluid connection mechanism, and - with the first fluid connection mechanism, limits the fluid connection space, - has a fluid inlet piece (29; 29a) for connection to the fluid supply line, - has a fluid-tight connection to the first fluid connection mechanism, and - with the first fluid connection mechanism, limits the fluid connection space, iii) wherein the first fluid connection mechanism and the second fluid connection mechanism (4; a) have a positive connection to one another, and characterised in that c) the first fluid connection mechanism has a second limiting wall, which limits the fluid connection space and runs opposing the first limiting wall, d) the first fluid connection mechanism is laterally open to the outside on both sides between the first limiting wall and the second limiting wall, and e) the second fluid connection mechanism (4; 4a) - is clamp-like and - closes the first fluid connection mechanism by its side limiting walls laterally to the outside in the direction of the centre axis. - is clamp-like and - closes the first fluid connection mechanism by its side limiting walls laterally to the outside in the direction of the centre axis.