This is a timely question for me. I was thinking of replacing the tubing and non-stainless parts on mine after a few years of use and I notice that they also offer a larger tune up kit for $16 that includes 4 pieces of the tubing length, also! Score....
By the way, I use mine on my 13 gallon kegmenter to rack 10 gallons of clear beer from the primary to 2 serving kegs, so I only need 1 of these to cover multiple serving kegs racked from the kegmenter. I skip the Clear Beer draft system in those cleared kegs. They completely clear in the time it takes to force carb at serving psi.