QD3 Female Quick Disconnect No-Spill Coupling, Compression for 13mm x 19mm (1/2in x 3/4in) *Black* 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 QD3 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 only 0.5-1mL freed with approximately 0.2mL freed. Fittings are chrome-plated brass. Max Pressure @ 25°C 8kgf/cm2 (113.8psi) Max Temperature 100°C (212°F)