Abstract: The invention relates to a pump for flowable media, particularly a cosmetic pump, provided with a base (1), which can be mounted tightly on the opening of a container, a through-hole (9) in the base (1), which extends from the underside of the base through to its top side, a tube sleeve (12) extending upwards from the top side of the base (1) around the through-hole (9), a guide sleeve (15) likewise extending upwards from the top side of the base, a top part (2) guided on the guide sleeve (15) that can be depressed against a compression spring (16), a compression chamber (23) with an inlet valve (24) and an outlet valve (25), and an outlet channel (33) provided downstream of the outlet valve (25).