The end piece (10) has a tubular body (11) with a conduit (12) that is extended from an end (14) to be attached to a container i.e. bottle (18), containing a product to be swabbed until another end (16). The latter end supports a substrate i.e. pad, to be soaked with the product. The latter end includes an ovoid shaped loop (24) supporting the substrate, where the loop is connected to the tubular body so that the conduit emerges inside the loop. The conduit opens at an inner peripheral edge (28). The tubular body includes a portion projected with respect to the inner peripheral edge.
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