a flange 16 which presents an upper surface 18 surrounding the opening 14 a sidewall 20 about its periphery and an inwardly directed ledge 22 at the bottom of the flange the container is typically made of glass although other types of materials such as plastic or metal can be utilized an assembly in accordance with the present invention is particularly suited for use with cosmetic containers such as those containing perfume an assembly in accordance with the present invention includes a mounting sleeve 24 and a sealing collar 26 the sealing collar 26 is formed of a deformable material and preferably a resilient deformable material such as polyethylene including linear low density polyethylene rubber elastomers or vinyl the sealing collar 26 includes a ring 28 having a floor 30 for contacting the upper surface 18 of the container flange the collar 26 includes a protrusion 32 extending from the ring 28 the protrusion 32 has an inner diameter when made to collapse inward sized to receive the sidewall of the flange 16 and preferably the inner diameter of the protrusion is slightly less than the diameter of the flange wall to provide a snug frictional fit the protrusion 32 is preferably generally cylindrical and symetric with respect to axis 36 the sealing collar 26 can be designed to receive any number of different types of dispensers including pumps valves shaker plug type valve squeeze type valves and pouring type valves the collar includes a central opening 40 for receiving the dispenser such as a pump and includes other structures which are designed specifically for the type of dispenser to be used with the assembly thus the portion of the sealing collar 26 above the ring is not described.