An adapter is disclosed for an ostomy coupling. The adapter provides a floatablecoupling characteristic to an ostomy body fitment that has a non-floatable couplingpart. The adapter comprises a first coupling part for attaching to the non-floatingcoupling part of the body fitment, a second coupling part for releasably attachingto an ostomy appliance, and a flexible collar between the first and second couplingparts. The flexible collar permits the second coupling part to be displaced awayfrom the first coupling part, thereby creating a space for an ostomate to manuallybrace the second coupling part against an attachment force when an applianceis fitted.