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4th Gen
Koolance's Generation 4 quick disconnect couplings are dripless upon disconnection up to 0.5kgf/cm2 (7psi) of pressure.
![QD2 Series](https://koolance.com/image/cache/data/categories/cat_fittings_qd2-m_threaded-74x74.jpg)
QD2 Series
The QD2 series includes couplings for 6mm (1/4 inch) internal diameter tubing.
![ID: 06mm (1/4in)](https://koolance.com/image/cache/data/categories/cat_fittings_qd2-m_hose06-74x74.jpg)
![Threaded](https://koolance.com/image/cache/data/categories/cat_fittings_qd2-m_threaded-74x74.jpg)
![QD3 Series](https://koolance.com/image/cache/data/categories/cat_fittings_qd3-m_threaded-74x74.jpg)
QD3 Series
The QD3 series includes couplings for 10 to 13mm (3/8 to 1/2 inch) ID tubing.
![ID: 10mm (3/8in)](https://koolance.com/image/cache/data/categories/cat_fittings_qd3-m_hose10-74x74.jpg)
![ID: 13mm (1/2in)](https://koolance.com/image/cache/data/categories/cat_fittings_qd3-m_hose13-74x74.jpg)
![Threaded](https://koolance.com/image/cache/data/categories/cat_fittings_qd3-m_threaded-74x74.jpg)
![QD4 Series](https://koolance.com/image/cache/data/categories/cat_fittings_qd4-m_threaded-74x74.jpg)
QD4 Series
The QD4 series includes couplings for 13mm (1/2 inch) ID tubing.
![ID: 13mm (1/2in)](https://koolance.com/image/cache/data/categories/cat_fittings_qd4-m_hose13-74x74.jpg)
![Threaded](https://koolance.com/image/cache/data/categories/cat_fittings_qd4-m_threaded-74x74.jpg)
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