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