Not sure if you looked at the add I have on e-bay or not? This is a tubular finned cooler, you will route your top end oil line from the engine in one end and from the other end you will run a line to the head. There are alot of these on the market, Fluidyne is the first one I have seen that has built it with the fins actually continuing through the tube to the inside. The engine oil flows through the tube and the heat is dissipated through the fins. We used one made by Afco and it works very well, this Fluidyne one is way better. I hope this helps and I hope you were able to see a picture. Everytime I try to load a picture on this site it says the file is too large, not sure why?