looks like a rubber tube. Im suspecting last owner tried to use it to drain the oil and either thought it was ok to push it in for next oil change or somehow it fell in there during assembly but i doubt that.
boats been running great. Trim went out but cleaned contacts on limit switch and its working as it should. Im at about 5200 rpm at WOT but i think thats due to prop pitch. Im gonna get a new prop with 2 or 3 degree inc in pitch.
PS i dont run the boat at WOT much at all( just to test it) for this reason. My question is what brand Propeller do you all recommend?