A siphon arrangement comprising a housing comprising an inlet port, an outlet port and a siphon seat arranged between inlet port and outlet port, and a siphon element arranged in the siphon seat and comprising a siphon section, as well as an inlet, which faces the inlet port, and an outlet, which opens out into the siphon seat, wherein water can be guided from the inlet port into the siphon section via the inlet, and from the outlet into the siphon seat, and subsequently to the outlet port, wherein the siphon element is mounted in the housing so as to be movable from a usage position into a maintenance position, and is removable, in particular extractable, from the housing from the maintenance position along a principal direction via an access opening, and wherein the siphon element is configured such that, in its maintenance position, it is substantially completely emptied; wherein the siphon element and the access opening are configured such that the siphon element is removable from the housing solely when the siphon element lies in its maintenance position; wherein the siphon element comprises a coding element, and wherein the access opening has a shape consistent with the coding element, wherein, in the maintenance position, the coding element lies relative to the access opening such that the siphon element is removable from the housing, wherein the siphon arrangement further comprises a cap, which closes off the siphon seat in the region of the access opening, wherein the cap is mounted, in the region of the access opening, on a bearing structure on the housing and the coding element is a flat shield. a housing comprising an inlet port, an outlet port and a siphon seat arranged between inlet port and outlet port, and a siphon element arranged in the siphon seat and comprising a siphon section, as well as an inlet, which faces the inlet port, and an outlet, which opens out into the siphon seat, wherein water can be guided from the inlet port into the siphon section via the inlet, and from the outlet into the siphon seat, and subsequently to the outlet port, wherein the siphon element is mounted in the housing so as to be movable from a usage position into a maintenance position, and is removable, in particular extractable, from the housing from the maintenance position along a principal direction via an access opening, and wherein the siphon element is configured such that, in its maintenance position, it is substantially completely emptied; wherein the siphon element and the access opening are configured such that the siphon element is removable from the housing solely when the siphon element lies in its maintenance position; wherein the siphon element comprises a coding element, and wherein the access opening has a shape consistent with the coding element, wherein, in the maintenance position, the coding element lies relative to the access opening such that the siphon element is removable from the housing, wherein the siphon arrangement further comprises a cap, which closes off the siphon seat in the region of the access opening, wherein the cap is mounted, in the region of the access opening, on a bearing structure on the housing and the coding element is a flat shield.