Abstract: A capsule (1) for insertion into a bore of a porous element to apply treatment substance to the interior of the element and having a container (2), with at least one internal cavity (3) for receiving treatment substance and an outer stop flange (8), and a plug (4) received in and fixed to the container through a common interconnecting land (5). A first container shank portion (6) that extends from a first insertion end (1A) of the capsule and up to the area of the interconnecting land has a uniform, generally cylindrical shape, a second container shank portion (7) extending away from said container first shank portion, from the area of the inter-connecting land towards the outer stop flange, at least at an inner surface (7B) thereof has an outwardly slightly diverging, conical shape and at an outer surface (7A) thereof, separated a short distance from the outer stop flange has a first circumferential beveled edge (9) serving as a transition to an outer increased diameter section (7C).

Abstract: A capsule (1) for insertion into a bore of a porous element to apply treatment substance to the interior of the element and having a container (2), with at least one internal cavity (3) for receiving treatment substance and an outer stop flange (8), and a plug (4) received in and fixed to the container through a common interconnecting land (5). A first container shank portion (6) that extends from a first insertion end (1A) of the capsule and up to the area of the interconnecting land has a uniform, generally cylindrical shape, a second container shank portion (7) extending away from said container first shank portion, from the area of the inter- connecting land towards the outer stop flange, at least at an inner surface (7B) thereof has an outwardly slightly diverging, conical shape and at an outer surface (7A) thereof, separated a short distance from the outer stop flange has a first circumferential beveled edge (9) serving as a transition to an outer increased diameter section (7C).