Hose couplings

In a hose coupling having two tubular coupling parts (1, 2), which can be plugged together, the first coupling part (1) has a circumferential holding rib (4) with a radial flank (5) and a conical flank (6). This holding rib (4) is crossed by axial decoupling ribs (8) extending radially up to the height of the holding rib (4). The second coupling part (2) has radially resilient holding arms (17) with catches (18) which can be engaged behind the holding rib (4). The number and angular intervals of the holding arms (17) and decoupling ribs (8) are equal. In order to avoid the catches (18) from being seated on top of the decoupling ribs (8) when the coupling parts (1, 2) are being plugged together, such that unintentional decoupling is possible, the decoupling rib (8) is provided before the ridge (7) of the holding rib (4) with a radial projection (13), the width (x) of which is at least equal to the ridge width (y) of the portion (11) of the decoupling rib located on the side of the radial surface (5) of the holding rib.