The present invention relates to vacuum pump, to the extent that the difficulties of putting similar products in automatic assembly and production, assembly would be resolved. A pump core assembly, the pump body of the pump core assembly is provided with an elastic sleeve, the inner diameter of the upper plug of the inner plug outwardly of the pump body is provided with a lower elastic cavity that is larger than the inner diameter of the plug, the inner diameter hole of the upper plug of the inner plug is provided with the upper elastic cavity of the outer diameter of the valve stem whose outer diameter is smaller than the inner diameter of the upper plug.
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