radius = 8.25;
wall = 6;
len = 60;

rotate([0,90,0]) difference() {
    cylinder(r=radius + wall, h=len, center=true);
    translate([0,0,len/2+wall/2]) cylinder(r=radius, h=len, center=true);
    translate([0,0,-len/2-wall/2]) cylinder(r=radius, h=len, center=true);
}