tunze silence pump

my return bulkhead is 1/2 and it's already installed, the return pump i have right now is an eheim 1250 with an output of 1/2 and i', using a 1/2 tubing, i'm changing all my equipments to tunze.

please help me on what to buy so i can use this pump with the existing 1/2 bulkhead and tubing?
 
It will reduce the flow a little but you could just buy a hardware store reducing barb from 3/4" - 1/2" you will need a small piece of 3/4" tubing to make this work.
 
I would consider it risky, you are stressing the tubing and some day it may burst or pop off.
 
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