I have some koolance QDC fittings and they are very nice. nice heavy feel to them, nice finish, etc. Very different to the 'oem' cheapo ones I have on my external stuff.
i have a few the QDC are good but the red orings are really really soft and hard to replace with nitril of the same size cause the nitrill ones dont compress as much so if you split a red one you have to go slightly undersize on the nitril so that they stretch a bit and they donmt need to compress as much or you wont get a seal
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