An external catheter stabilizer device for stabilizing and retaining a catheter tube at a stoma includes a base portion and a central portion. The base portion is configured to be affixed at a patient so as to generally surround a stoma. The central portion has a passageway therethrough that is configured to receive a tube that passes through the stoma. The base portion is attached to the central portion via at least two spaced apart spokes. A catheter tube retaining element is disposed radially outboard of the passageway and is configured to receive and retain a portion of the catheter tube therein. When the base portion is affixed at a patient, the central portion is spaced away from the patient. The device may include features that provide both stabilization and selectable modes of operation, such as a free-flow mode and a no-flow mode.