Crux if you don't finish on Refrig. crack is pulling the roof. It isn't any harder than Guzzler's roof, at the same rating. If you finish on Refrig. crack the crux will be pulling through the wide slot at the top.
At the main entrance go past Guzzler and follow the trail. Once you pass the Prehistoric wall(orange with hard routes) you will continue another small distance and probably spot Refrigerator Crack first. This route is the hand crack directly left of that, I prefer to finish on Refrig. Crack, but either way is exciting. If you go all the way to Linda's Corner you've missed it.
Start of this one is small to medium cams in the crack. If you finish on Refrigerator Crack you will need a large cam for the top.