Abstract: A discharge connection, an inlet pipe, an outlet pipe and a drain channel are provided. On an outer end, the outlet pipe has an outwardly closing check valve with a valve body and a valve seat. The outlet pipe has a first coupling geometry at the outer end, which can be interlockingly connected to a conduit coupling. The check valve is designed to be moved from the valve seat into a open position, spaced apart from same, by a profile element projecting into the outer end.

Abstract: A fluid line having a wave form portion is furnished. The wave form portion extends at least at a minimum distance along a longitudinal axis of the fluid line. The wave form portion has a wave peak element (18), which itself has, along a peripheral direction extending around the longitudinal axis of the fluid line, a varying distance from the longitudinal axis, the distance including a distance curve in the peripheral direction, the distance curve providing a non-circular contour. A fluid line is thus provided having a wave form portion, which fluid line reduces the pressure drop at the wave form portion.