On 2015-07-29 11:36 PM (-4), bakom wrote:
> #macro Pipe(p1, p2, r1, r2, r3, r4)
>    difference
>    {
>      cone {p1, r1, p2, r3 hollow on}
>      cone {p1, r2, p2, r4 } hollow off
>     texture{ pigment{ rgb 0.9}}
>    }
> #end

First of all, the hollow keyword is totally irrelevant to your problem. 
  The hollow keyword is for allowing media inside transparent objects, 
not for making hollow shapes.

At first glance, it appears your problem is coincident surfaces.  The 
ends of the inner pipe are in exactly the same planes as the ends of the 
outer pipe.

http://wiki.povray.org/content/Documentation:Tutorial_Section_2.1#Co-incident_Surfaces

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