Silicone tubing can be used to transfer wort, beer or used as a blow off tube. We use an ultra clear Silicone tubing which allow you to see wort transferring very easily. We also use 1/8" thickness which prevents hose kinking. 

Specs:
-1/2" ID
-3/4" OD
-FDA approved Silicone
-Platinum cured 
-Rated up to 500F