a sankey coupler. Thats really it, depending on hose size.
my advice get a couple and unhook you ball/pin lock connector and see how the tubes fit.
3/16 is what I use on both commerical and homebrew kegs' liquid lines.
If you're planning on switching back and forth, these are nice to have: http://www.austinhomebrew.com/Beer/...Easy-Switch-Sanke-to-Corne-MFL-Tailpiece.html
Then you don't have to have to deal with switching the line when you want to go from sanke to corny. Just don't forget the washers.
If you went with the low profile, I think there's an adapter that has MFL on one end and the appropriate threads on the other.
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