A urinal siphon (1) has a tubular inlet piece (2) for connecting the urinal siphon (1) to a drain line of a urinal, a tubular outlet piece (4) for connecting the urinal siphon (1) to a sewer line, a spiral-like, tubular intermediate piece (6 ), which is interposed between the inlet piece (2) and the outlet piece (4) and which has at least two partial sections (8) each angled by 180 degrees, a sliding sleeve (14) by means of which the outlet piece (4) relative to the inlet piece (2 ) is attached to the inlet piece (2) or the intermediate piece (6) so as to be displaceable by an extension length (L), and a limiting device (50) by means of which the outlet piece (4) can be displaced relative to the inlet piece (2) over the extension length (L ) is prevented.
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