Trailer tow-bar

The coupling (1) has a clutch housing (3), an indicator (2) for a clutch wear, and a clutch bowl contacting a tiltable clutch lever (13). The clutch lever rises through a housing opening (6) at an upper side of the clutch housing, where the coupling is opened and closed by an impact of the clutch bowl. The indicator has an indicator carrier connected with the clutch lever and arranged in a region of the housing opening. The indicator carrier carries multiple indicating elements, which indicate a wear degree and/or an open position of the coupling.