Odour trap

The present invention relates to an odor trap intended for installing in a pipe to a drain. The odor trap comprises a tubular element (1) and a blocking means (2). The blocking means (2) makes it possible to close the pipe but is shiftable by fluid flowing in the odor trap in order to allow said fluid to pass, and in order, when the fluid has passed, to return to the position which closes the pipe. To achieve an odor trap in which the blocking means is well protected against undesirable external influences and the configuration of the odor trap is such that it is easy to fit, the tubular element (1) is made of inelastic material and the separate blocking means (2) disposed in the tubular element is made of elastically deformable material, said blocking means comprising a fitting portion (6) removably connected to a fitting portion (7) of the tubular element, and a blocking portion (8) which is integral via a peripheral edge (9) with the fitting portion of the blocking means, and which, when in the position which closes the flow cross-section of the pipe, abuts, via the peripheral edge, fluidtightly against the inside of the tubular element and which, possibly with parts of the fitting portion of the blocking means, is to a varying degree shiftable by the fluid to allow the fluid to pass.