The adjustable fin that hangs from the cavatation plate just behind the prop. It has a small hole in the front of it that picks up water and shoots it up into the exhaust housing. I understand the purpose of the fin. What is the purpose of shooting a small stream of water up into the leg??? I am asking because the person that had this motor before me ground the fin off the plate. There is sill a small hole in the plate where the fin was but it probably does not pick up as much water. <br /><br />Thanks