A single-use ostomy appliance is described including an ostomy coupling for releasable coupling first (18) and second (16) portions at a stomal orifice. The two portions may be separable body-side and non-body-side parts, or the two portions may be portions of a unitary ostomy device such as a controlled evacuation device. The coupling includes a mechanical fastener (14) configured such that the coupling is rendered substantially not resecurable after the fastener is released.
