Concentric to Eccentric tool changes the shape of TEE, CROSS or Reducer so that one of its side is straightened out. This tool also moves entire network after the selected component so as to align with its side 
Select a Concentric Tee or a Concentric reducer. 
In case of reducer user has to specify the side on which reducer has to be straighten out.
Entire ducting after the Selected component is also adjusted