Koolance patented quick disconnect no-spill coupling with automatic shutoff. 10mm (3/8in) ID, 16mm (5/8in) OD male straight connection with compression fitting. 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. Coolant volume lost upon disconnection will rise with internal pressure higher than 0.5kgf/cm2 (7psi). General Weight: 0.16 lb (0.10 kg) Max No-Spill Pressure: 0.5kgf/cm2 (7psi) Max Pressure Tolerance at 25C: 8kgf/cm2 (113.8psi) Max Temperature Tolerance: 80C (176F) Min Pressure Tolerance at 25C: -1.0kgf/cm2 (-14psi) Min Storage Temperature (*No Freezing): -20C (-4F) Seal Material: EPDM (Water/Glycol Liquids) Wetted Materials: Brass, Stainless Steel, EPDM Model: QD3-MT10X16