FIELD: medicine. SUBSTANCE: invention relates to sealing devices designed for sealing vessels with medicines, blood and blood substitutes closed by rubber plugs. Proposed cap, according to version 1 is provided with cavity on tearoff section 3 of bottom. Cavity is located concentrically relative to cuts 4, with convex side pointed from bottom 1. Edges of cuts 4 are tilted inwards the cap through angle of 4o - 1o. According to version 2, ring step 10 is made on bottom 1 of cap directed inwards the cap, and tearoff section 3 of bottom 1 is formed by cuts 4 made on ring step 10. Edges of cuts 4 are tilted outwards the cap through height "h" not exceeding size "H" of cavity of step 10, η>H. EFFECT: prevention interference of caps at automatic feeding in sealing devices. 8 cl, 4 dwg
