$IDFlange = 125;
$ODFlange = 170;
$HFlange = 3;
$HAdapt = 50;
$DHose = 100;
$fn=100;

difference()
{
union()
{

translate([0,0,$HAdapt])
difference() //lip
{   
   cylinder(h=$HFlange,d=$DHose+$HFlange*2);
   cylinder(h=$HFlange,d=$DHose-$HFlange*2);
}

difference() //base
{
   cylinder(h=$HFlange,d=$ODFlange);
   cylinder(h=$HFlange,d=$IDFlange);
}

difference() //cone
{
    cylinder(h=$HAdapt,d1=$IDFlange+$HFlange*2,d2=$DHose);
    cylinder(h=$HAdapt,d1=$IDFlange,d2=$DHose-$HFlange*2);
}
}

union()
{
translate([80,0,0])
   cylinder(h=20,d=5);

rotate([0,0,120])
   translate([80,0,0])
      cylinder(h=20,d=5);

rotate([0,0,-120])
   translate([80,0,0])
      cylinder(h=20,d=5);

translate([0,(75+20/2),0])
   cube([100,20,10],true);

translate([-(75+20/2),0,0])
   cube([20,100,10],true);
}
}