A QUICK COUPLER FOR AUTOMOTIVE FLUID TRANSPORT TUBING, comprising two locking members (21, 22) coupled together, characterized in that: - one locking member of the two locking members (21, 22) comprises: • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially outer teeth spaced each other by gaps defined by the axially inner surface; and • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface - so that both referred teeth (212, 213) are not superimposed, being positioned concentrically to each other and extending perpendicularly from the axially inner surface of the ring-shaped base; and - the other locking member of the two locking members (21, 22) comprises: • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface; • so that the said radially inner teeth extend perpendicularly from the axially inner surface of the ring-shaped base; • so that the said radially inner teeth of the other locking member are superimposed in relation to the radially outer teeth of the one locking member, and the referred radially inner teeth of the other locking member are accordingly aligned to the radially inner teeth of the one locking member. - one locking member of the two locking members (21, 22) comprises: • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially outer teeth spaced each other by gaps defined by the axially inner surface; and • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface - so that both referred teeth (212, 213) are not superimposed, being positioned concentrically to each other and extending perpendicularly from the axially inner surface of the ring-shaped base; and • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially outer teeth spaced each other by gaps defined by the axially inner surface; and • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface - so that both referred teeth (212, 213) are not superimposed, being positioned concentrically to each other and extending perpendicularly from the axially inner surface of the ring-shaped base; and - the other locking member of the two locking members (21, 22) comprises: • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface; • so that the said radially inner teeth extend perpendicularly from the axially inner surface of the ring-shaped base; • so that the said radially inner teeth of the other locking member are superimposed in relation to the radially outer teeth of the one locking member, and the referred radially inner teeth of the other locking member are accordingly aligned to the radially inner teeth of the one locking member. • a ring-shaped base having an axially outer surface and an axially inner surface; • at least four radially inner teeth spaced each other by gaps, which are defined by at least four self-locking sockets comprised in the axially inner surface; • so that the said radially inner teeth extend perpendicularly from the axially inner surface of the ring-shaped base; • so that the said radially inner teeth of the other locking member are superimposed in relation to the radially outer teeth of the one locking member, and the referred radially inner teeth of the other locking member are accordingly aligned to the radially inner teeth of the one locking member.