Quick Disconnect Couplings
Koolance quick disconnects couplings are specially designed fittings which automatically shut-off coolant flow upon disconnection. The flow path is reestablished when the QDC couplings are reconnected. Quick disconnects are very useful for areas in a cooling or plumbing system that are altered and moved frequently. They can also increase convenience when transporting or draining a system.
QD1H Series
The QD1H series includes couplings for 3mm (1/8 inch) internal diameter hose and is physically the smallest size. No-spill quick disconnect couplings which push to connect with a negligible amount of coolant freed.
ID: 03mm (1/8in) (2)
Threaded (1)
QD2 Series
The QD2 series includes couplings for 6mm (1/4 inch) internal diameter hose. No-spill quick disconnect couplings which push to connect with a negligible amount of coolant freed.
ID: 06mm (1/4in) (4)
Threaded (4)
QD3 Series
The QD3 series includes couplings for 10 to 13mm (3/8 to 1/2 inch) ID hose, is the most popular size, and has the widest range of fittings. No-spill quick disconnect couplings which push to connect with a negligible amount of coolant freed.
ID: 10mm (3/8in) (10)
ID: 13mm (1/2in) (11)
Threaded (9)
QD4 Series
The QD4 series includes couplings for 13mm (1/2 inch) ID hose and is physically the largest size. No-spill quick disconnect couplings which push to connect with a negligible amount of coolant freed.
ID: 13mm (1/2in) (4)
Threaded (4) 
