An anesthetic container includes an anesthetic receptacle and a valve assembly attachable to the receptacle. The valve assembly includes a valve seat with a first sloped surface and a valve member with a second sloped surface, the first and second sloped surfaces having different slopes. The first and second sloped surfaces abut each other to form a gasketless, fluid-tight seal therebetween with the valve assembly in a closed configuration. The valve member is spaced from the valve seat in an open configuration to permit the flow of the anesthetic from the receptacle. The valve assembly may also include an exterior groove and a toroidal sealing member disposed in the groove, the toroidal sealing member having an X-shaped cross-section.
