The water in/out fittings used on iStills are purchased at Gardena's. Pretty much the standard in Europe, and available all over the world. If you want to buy Gardena plugs to connect water in/out hoses to your iStill's water in/out system, here's a site that will direct you to your country's Gardena website ...

http://www.gardena.com/

www.iStill.eu