An IV flow rate regulator for precision dosage of medical liquids comprising: a first part, a second part with at least one integrated outlet tubular connector and a mating attachment part with at least one integrated inlet tubular connector, said first, second and mating attachment parts made of moulded plastic material and being coupled to one another in a rotatable manner about an axis of rotation, the first part comprising in a single piece a circular wall with formation of a hole, the circular wall being provided with a first surface and a second surface, the circular wall comprising at least one dosing groove on each of the first and second surfaces in communication with said inlet tubular connector and with said outlet tubular connector, a first gasket made of elastomeric material being positioned in a spaced apart depression integrally made in a base wall of said second part, said first gasket being provided with at least one first through hole to the outlet passage of the tubular outlet connector, wherein said first through hole is positioned in connection coaxially with a second through hole formed in a second base wall of said second part in communication with said tubular outlet connector, a second gasket made of elastomeric material being positioned in a spaced apart depression integrally made in a base wall of said mating attachment part, said second gasket being provided with at least one third through hole corresponding to the inlet passage of said tubular inlet connector, wherein said third through hole is positioned in connection coaxially with the second through hole formed in the base wall of said second part in communication with said tubular inlet connector, said at least one dosing passage groove being provided between said first and second gaskets, said dosing groove opening progressively the communication between said inlet tubular connector and said outlet tubular connector by means of the relative rotation of said first and second parts, characterized in that the first gasket and the second gasket comprise a plurality of annular legs projecting radially from the outer periphery of the gaskets, wherein the annular legs are inserted in the spaced apart depression (62, 162). a first part, a second part with at least one integrated outlet tubular connector and a mating attachment part with at least one integrated inlet tubular connector, said first, second and mating attachment parts made of moulded plastic material and being coupled to one another in a rotatable manner about an axis of rotation, the first part comprising in a single piece a circular wall with formation of a hole, the circular wall being provided with a first surface and a second surface, the circular wall comprising at least one dosing groove on each of the first and second surfaces in communication with said inlet tubular connector and with said outlet tubular connector, a first gasket made of elastomeric material being positioned in a spaced apart depression integrally made in a base wall of said second part, said first gasket being provided with at least one first through hole to the outlet passage of the tubular outlet connector, wherein said first through hole is positioned in connection coaxially with a second through hole formed in a second base wall of said second part in communication with said tubular outlet connector, a second gasket made of elastomeric material being positioned in a spaced apart depression integrally made in a base wall of said mating attachment part, said second gasket being provided with at least one third through hole corresponding to the inlet passage of said tubular inlet connector, wherein said third through hole is positioned in connection coaxially with the second through hole formed in the base wall of said second part in communication with said tubular inlet connector, said at least one dosing passage groove being provided between said first and second gaskets, said dosing groove opening progressively the communication between said inlet tubular connector and said outlet tubular connector by means of the relative rotation of said first and second parts, characterized in that the first gasket and the second gasket comprise a plurality of annular legs projecting radially from the outer periphery of the gaskets, wherein the annular legs are inserted in the spaced apart depression (62, 162).