Quote Originally Posted by RanRan View Post

To answer your questions - if you don't see a gasket then there is probably an 'O' ring at the junction.
This is correct. There is a silicone o-ring between the pipe and the aluminum part you see around the pipe with the bolts in it. The o-ring fits in a bevel on the top side of the aluminum part and gets squeezed tight between the port on the head, the pipe, and the aluminum ring with the bolts in it.

Pete D.