[Paraview] PV 4.1 how to extract a surface

[Stephen Wornom]

The mesh is 3D unstructured about a 3D cylinder. I would like to extract the surface of the cylinder. 

I have experience extracting surfaces with another code where the surfaces are defined by a variable (-3= cylinder surface). 
I do it like this: 
1-select extract surface 
2-select conductivity 
3-select threshold (choose -3 which corresponds to the cylinder surface). 

but I am using a code where the cylinder surface is NOT a predefined variable. 
How do I do I extract the surface? 
Hope my question is clear, 
Stephen 


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