4th Gen
Koolance's Generation 4 quick disconnect couplings are dripless upon disconnection up to 0.5kgf/cm2 (7psi) of pressure.
QD2 Series
The QD2 series includes couplings for 6mm (1/4 inch) internal diameter tubing.
ID: 06mm (1/4in)Threaded
QD3 Series
The QD3 series includes couplings for 10 to 13mm (3/8 to 1/2 inch) ID tubing.
ID: 10mm (3/8in)
ID: 13mm (1/2in)Threaded
QD4 Series
The QD4 series includes couplings for 13mm (1/2 inch) ID tubing.
ID: 13mm (1/2in)Threaded 
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