Abstract: In a heat shrinkable synthetic resin cover adapted to seal a joint between two pipes or an electric cable, the cover is made of a rectangular sheet shaped cross-linked polymer and a flexible electric heater covered by a cross-linked polymer contained in a heat shrinkable synthetic resin member such that the electric heater crosses at right angles an inherent direction of heat shrink of the member so as not prevent inherent heat shrink thereof.

Abstract: A heat shrinkable synthetic resin cover is made of a rectangular sheet shaped cross-linked polymer. A flexible electric heater covered by a cross-linked polymer is contained in a heat shrinkable synthetic resin member so that the electric heater crosses at right angles to an inherent direction of heat shrink of the member so as not to prevent inherent heat shrink thereof. Further, a pair of tongues are provided along each end edge of the heat shrinkable synthetic resin member. When the cover is applied to seal a joint between two pipes or electric cables, the tongues on the opposite end edges are superposed one upon another to interconnect both end edges of the cover.