The bushing (190) has a receptacle (16) to receive a dropper neck of a vial with a product and including a shape matching the neck. A body (191) has an upper portion (2) cooperating with the neck part and a lower portion (3) to cover a neck of another vial with another product. The receptacle section varies by decreasing from the portion (2) till the portion (3) for being cooperated with the dropper neck. A stopper (110) has a shape that is complementary to that of the receptacle. A lid cooperates with an external part of the body. The body, stopper and lid are molded in plastic material.
