This is a complete 3 piece exhaust elbow assembly including the riser,  mixer and connecting joint that fits Yanmar YM and GM series engines.  It was taken off a brand new 3YM30AE engine before it was installed as the customer needed a different elbow.  It is set up and sealed from the factory and ready to install as is,  no set up required.   Ships with new Yanmar gasket as well.  Part numbers are 128370-13610  124070-13520  104214-13580