Computersight -

To draw the gasket, set Linear Units to Engineering with a precision of 0′-0.00″. Set Angular Units to Decimal with a precision of 0.00. Now, follow these steps:
1. Use the Line command to draw a rectangle 4″ wide and 3″ high.
2. Offset the upper horizontal line and the left vertical line 1″ to the
inside of the rectangle.
3. Use Fillet with a radius set to 1″ on the upper-left corner of the original
rectangle.
4. Draw the circle with the 0.25″ radius, using the intersection of the
two offset lines as the center.
5. Erase the offset lines.
6. Offset the right vertical line 2″ to the left and the bottom horizontal
line 1.5″ up.
7. Use Fillet with a radius of 0.50″ on the intersection of these two lines,
retaining the right and lower segments.
8. Trim back the lower-right corner of the original rectangle.
9. Draw circles with 0.50″ and 0.75″ radii on the bottom and right sides
of the shape.
10. Use Trim to remove unneeded lines.
11. Use Mirror to flip the shape down.
12. Use Mirror again to flip the shape to the right.
13. Erase unneeded lines. (Each line to be erased is really two lines.)

If you choose to save this drawing, name it Gasket-05.dwg.