Inner thread
Quick couplings with female thread used mostly on risers, pressure reducing valves and ball valves for easy hose connection.
Bestsellers

DMfit quick connector with a 7/16 UNF internal thread and an outlet for a 6,35mm hose.

DMfit quick connector with a 3/4" internal thread and an outlet for a 6mm hose.

DMfit quick connector with a 1/2 internal thread and an outlet for a 6,35mm hose.

DMfit quick connector with a 1/4" internal thread and an outlet for a 6mm hose.

JG quick connector with a 1/4" internal thread and an outlet for a 6mm hose.