FIELD: sealing-up high-pressure vessels. SUBSTANCE: proposed device has cap with locking member and internal projections; locking member is made in form of transversal projection; upper part of said cap is provided with internal longitudinal projections ensuring rigidity of device; in center of cap end face there is hole, 10 mm in diameter and guide skirt on its inner side; lower part of cap is provided with gripping ears on outer surface and four longitudinal perforated slots on inner surface. EFFECT: avoidance of unauthorized access. 4 dwg
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