The invention concerns an adapter for vials containing physiological solutions for pediatric use, in particular but not only for washing the nasal cavity, where each vial comprises a body made of a flexible material, that terminates in a nozzle at the top and which can be gripped and squeezed manually to cause the washing solution to exit from said nozzle, characterised by a cap element (13), that fits and closes a top zone of the vial body and which ends with a head (14) which overlaps the nozzle of the vial and which has a hole at the top (15) for the exit of the fluid to be delivered contained in the vial.
