bung

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The traces of RDX explosive, used in Semtex, were detected on the rubber bung worth just a few pounds, which had never been replaced since the second-hand machine was installed.
To purchase an automated bench-top crimper machine to seal caps on to glass vials stoppered with rubber bungs. a new machine is required to increase productivity while also decreasing the risk and seriousness of a potential health & safety incident when capping glass vials.
She also had two small bottles of perfume with rubber bungs, one was called Tonight or Never, I think made by Rimmel, and the other was Californian Poppy from Woollies.