Originally Posted by jar
I read something in my searching on here just now about using some sort of washer in between flare fittings. I didn't do this. Is it necessary?
Any place that you have flare fittings that are metal to metal, like the connection between your gas lines and your flared shutoff valves, you will need to insert a flare gasket. They are made in plastic (available at any HBS) or copper (avaiable at any plumbing supply).
The connection between the flare swivel on your lines and the QD's on the kegs does not require a flare gasket. The tip of the flare on the QD's is plastic and acts as a gasket. Here is a photo of the plastic flare gaskets.