Koolance QD4 Quick Disconnect No-Spill Coupling, Male Compression 13 x 19mm (1/2 x 3/4in)

Koolance patented quick disconnect no-spill coupling with automatic shutoff. 13mm (1/2in) ID, 19mm (3/4in) 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. Coolant volume lost upon disconnection will rise with internal pressure higher than 0.5kgf/cm2 (7psi).

*NOTE: Liquid Coolants Koolance's product warranty does not cover the use of 3rd-party coolants, coolant additives, or corrosion. Koolance LIQ-702 or LIQ-705 coolants are strongly recommended to help avoid issues with mixed metals or biological growth. Additionally, do not use aluminum with bare (unplated) copper or bare (unplated) brass in the same system. Do not use silver with nickel in the same system.*

Weight	0.28 lb (0.13 kg)
Materials	Brass, Nickel Plating, Stainless Steel, EPDM
Max Pressure @ 25°C	8kgf/cm2 (113.8psi)
Max Temperature	100°C (212°F)

Intended Tubing Size

ID: 13mm (1/2)

OD: 19mm (3/4)

Wall: 3mm (1/8)

A full set of QD4 fittings costs ~$27.50 to $29.50, which is a significant addition over the QD3 series. The trend of using larger 1/2″ x 3/4″ tubing and fittings is decreasing rapidly in PC DIY watercooling, and the threaded versions will need an adapter which is an additional cost.They finally have acknowledged, albeit via a silent revision, that their black finish fittings needed changes and the new ones have held up well in my 10 week long test. The locking collar with pull to disconnect type design works very well, and flow performance is decent.

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