Plug

A plug, particularly for plugging a tube or pipe, comprising an elongated tubular casing of elastomeric material having two open ends longitudinally spaced from each other;

• two cupped caps each inserted in a respective open end of said casing and bounding with said casing an interior of the plug, each of said caps having a conical cross-section circumferentially elongated wall extending inside said interior and having an outer surface in surface contact with a corresponding portion of the casing, each cap also having an inner surface, each of said walls being vulcanized to said corresponding portion of the casing so as to sealingly close the latter from both ends thereof;
• and a conical cross-section supporting ring mounted so as to support at least one of said caps and located so as to engage the inner surface of said one cap and urge said elongated wall thereof against the corresponding portion of the casing, each of said caps further comprising an end wall peripherally connected to the respective elongated wall, at least one of said end walls extending normal to the elongation of said casing and being even with a respective end face of said casing when said caps are in assembly with said casing, the end wall of at least one of said caps being provided with at least one through-going hole;
• and means for facilitating movement of the plug relative to the tube to be plugged, said facilitating means including a member fixedly mounted on one of said caps and extending outwardly away from the same.