Yanmar OEM "mixing elbow." We generally call these exhaust risers and this portion (#7) of the exhauster riser is typically replaced with the included joint (#10) and sold separately metal gasket (#2). Used in some 3JH and 4JH installation, check your requirements.
Boat models w/ 3JH and 4JH engine models:
1) When you order this special order item it sets off a chain of events like Willie Wonka in the chocolate factory. Once you turn the valve the chocolate is coming down the pipe. If you then decide you want caramel, the chocolate is still going to come out of the pipe. We can't put the Chocolate back in the pipe, so someone is going to have to eat it, and it's not going to be us! Your order can't be canceled, returned, or magically changed into caramel, so please order carefully the first time!
2) A 50% deposit will be billed when your order for this item is accepted. The balance will be billed when the product ships