Koolance (patent-pending) quick disconnect no-spill coupling with automatic shutoff. 13mm (1/2) ID, 19mm (3/4) OD female straight connection with compression fitting. It will only fit a Koolance QD4 male quick disconnect.

After pulling the ring on the female QDC side, the quick-disconnect fittings will separate. Liquid on both sides will be automatically obstructed with approximately 0.2mL freed. Fittings are chrome-plated brass. Maximum operating pressure is 8kgf/cm2 (113.8psi) @ 25C. Maximum operating temperature is 100C (212F).