This is how I put one together after a long and painfull process.
This is a picture of all the parts needed.
Rubber Maid 5 Gal cooler, Kewler Kit, and some barbs that change diameter sizes. You will also see that I decided to go with the Steet false bottom. Phils is ok, but it did not fit in the other cooler I attempted to use first.
Here is the order where you will install all the fittings together. The cooler will be to the left of the Ball valve. There is a machined nut. You take that off and flush it between the rubber gasket and the spiggot openng in the cooler.
In the end it will look like this....
If you look at the brass nut you will see that it is machined out. This is to be able to fit the washer very snugly againsst the cooler wall.
The challenges of the insde is that the spece btween false bottom and fittings to the outside world is not a lot. Another challenge is to be sure you get High Temp tubbing as the normal vynle tubbing wont hold. I actually got some steel clamps to just to be sure.