Koolance (patent-pending) quick disconnect no-spill coupling with automatic shutoff. G 1/4 BSPP threaded with panel-mount opposite a male \"QD3\" quick-disconnect. It will only fit a Koolance QD3 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, EPDM o-rings.Specification:- Size: 55 x 26 mm- Material: Brass, black- Maximum pressure during operation: 28.5 psi- Connections: - QD3: male - Connection: inch + Bulkhead