Abstract: A housing of length and cross-sectional dimension to enclose a given amount of tire sealing fluid is selected, coupled with a flexible hose at its output port with a pneumatic tire valve, and charged at its input port from a source of compressed air to inject the tire sealing fluid within the housing by means of the hose through the pneumatic valve to protect a tire against later blowouts or puncturing in use. In a preferred embodiment, the housing is constructed of a polyvinylchloride tube, while the hose is constructed of a clear vinyl composition.