Tube connection assembly with safety locking system for external filters for aquariums

A tube connection assembly for external filters for aquariums, of the type comprising a container that is closed hermetically by an upper lid and contains at least one filtering mass crossed by a water stream that is forced by means of a pump incorporated in said lid, said container being shaped so as to form, in the lid, parallel connectors, respectively for the input and output of the stream, in which said tube connection assembly engages, said tube connection assembly supporting the ends of tubes for connection to an aquarium, said tube connection assembly comprising two valves with cylindrical flow control elements, which are arranged coaxially and are rigidly coupled to each other, a lever-type regulator protruding from a central region of said flow control elements in order to move them simultaneously by rotating the regulator on a plane that is perpendicular to the common axis of rotation, a lever-type engagement system being articulated to said assembly between said regulator and said lid, acting on a same plane as said regulator, and having a wing for engaging said lid and a locking wing that allows the release movement by means of its insertion in a coverable seat that is present between said flow control elements and is accessible to said wing only when said lever-type regulator is in the position that causes the simultaneous closure of the valves.