It doesn’t just “sit” there. It is secure between the extension housing and upper exhaust housing. Picture shows it wrong. It needs two o-rings, top and bottom of the sleeve (Plus the one on top of the water pump cover).. It’s purpose is to complete the integrity of the drive shaft isolation tube. Surprise—it won’t run worth a hoot if you leave it out. Which end is up?? Hm-m-m, I’d have to look at it.
EDIT——Crap, I got that wrong. Corrections made.
