It's nice to check in every now and then with Dan . . . He built this "newer version" of a water cooled knuckle. You can remove the heads for service. A better design than the one-piece unitized head and cylinder combo of the two previous liquid knuckle water bubblers. Dan also built a new shop and everything is goin' great in Spicewood. Hope to see him soon, if not, I'll probably have to make a run down there. I asked if the ground was soft enough for tent stakes . . . "Oh, Noot - I got a special place just for you . . .hmmmm ?????"