Abstract: A noninvasive seal for a sucking chest wound has a rectangular base portion with an aperture in its center, and which is covered with an adhesive substance on its bottom surface. A one-way check valve has an outwardly extending horizontal flange at its lowermost portion, this flange is mounted on the underside of the base portion around the aperture in such a matter that a central opening in the valve body and the aperture in the base portion register with each other. The body of the check valve is made of a Teflon coated rubber to prevent blood from adhering to its inner walls. A seal ring made of Karaya-type gum having a diameter approximately equal to the length of the flange is mounted under the flange, and by adhering to it assures a fixed position of the check valve about the base and therefore about a wound.