Sealing means for a snap-on fitment

Sealing means for a snap-on fitment, comprising a body member having spaced apart inner and outer skirts engageable with opposite sides of the neck of a container, an annular wall interconnecting said skirts and overlying a terminal end of the container neck, an extension provided on said annular wall forming a tubular engaging portion and having an inner sealing surface, and an outwardly extending annular snap bead on said wall to facilitate a snap fit for the fitment, said wall having an annular relieved section therein adjacent said inner skirt and opening into the space between said skirts, said relieved section having opposed side walls and a bottom wall, one of said side walls forming an extension of the outer surface of said inner skirt, said bottom wall extending radially outwardly from said engaging portion, an outer surface of said interconnecting wall defining a first wall section with said bottom wall, said annular wall including a second wall section apart from said first wall section and extending inwardly from said outer skirt, said snap bead extending from an outer end of said first wall section, whereby any distortions imposed on said snap bead and on said sealing surface as occasioned by any dimensional and/or shape irregularities in the container neck are reduced by the relief between inner and outer engagements with the container neck thereby resulting in an isolation of any distortions of said skirts relative to one another, an isolation of any outer skirt distortion relative to said snap bead, an isolation of any inner skirt distortion relative to said sealing surface and the maintenance of dimensional stability between said snap bead and said sealing surface.