5th Gen
Koolance's Generation 5 quick disconnect couplings are dripless upon disconnection up to 10kgf/cm2 (142psi) of pressure.
QD1H Series
The QD1H series includes couplings for 3mm (1/8 inch) internal diameter tubing.
ID: 03mm (1/8in)
Threaded
QD2H Series
The QD2H series includes couplings for 6mm (1/4 inch) internal diameter tubing.
ID: 06mm (1/4in)Threaded
QD3H Series
The QD3H series includes couplings for 10 to 13mm (3/8 to 1/2 inch) ID tubing.
ID: 10mm (3/8in)
ID: 13mm (1/2in)Threaded 
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