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 (H) 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 (H) 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 . <EOS>