Generator exhaust


michael winand
 

Hi, I am installing a new genset into a super maramu 2000.
The engine is a kubota with a 50mm hose going to the vetas water lock. On the outlet of the water lock the hose reduces to 40mm. This is how the original is installed. It has a reducer 50 to 40mm glued  into the water lock.

Can anyone help with the reasons why the hose is reduced in diameter? 
The generator supplier  advised to have a 50mm hose going on the water lock outlet. 
Thanks 

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