Abstract: An ostomy appliance is disclosed for selectively sealing a stoma. The appliance includes a central elongated relatively rigid tube having inner and outer end portions. A cap is support to the outer end portion of the tube and is adapted to engage the users skin when the tube is inserted in a stoma. A flexible extendable and collapsible bellows is mounted on the inner end of the tube for sealing the inside of the stoma when the appliance is inserted therein. A flexible rod insertable through the cap and tube for engagement with the bellows extends the bellows to collapse it for insertion in the stoma.