Koolance QD3-FS13X19-BK QD3 Female Quick Disconnect No-Spill Coupling, Compression for 13mm x 19mm (1/2in x 3/4in) *Black*

Up to the standard of excellent engineering from Koolance

Absolutely no spills. I love being able to disconnect my gpu's without having to drane the water.

If you've got the money to throw around, these are a super handy way to streamline your liquid cooling design. It makes repairs and replacement of tubing SUPER easy. If you need to isolate a pump or radiator, you can do so without having to purge and drain your system. I HIGHLY recommend these for major components. The compression fittings are superb and easy to mount, with the large, easily turned nuts. You can get them more than tight enough with finger compression.However, they ARE bulky. Expect to lose two inches of flex on any build. They work great for pumps and radiators, but you'd be very hard pressed to get them to fit a connection from CPU to VGA, for instance.Make sure you order THE CORRECT QD # and the CORRECT PIPE FITTING SIZE. I ended up getting six QD #4s when I needed #3s, and I had to shell out the money for replacements and then ship back the originals.