A QUICK COUPLER FOR AUTOMOTIVE FLUID TRANSPORT TUBING, comprising two locking members coupled together, characterized in that : - one locking member of the two locking members 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 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 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 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 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 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 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 . <EOS>