These charts will help you find the dimensions of ovalized,squarized, and rectangularized pipe. Start by finding the pipes minor outside dimension from the left side of the chart. Move across to the right to find the major outside dimension. Then move up to the topmost header in yellow. This will give you the round pipe size you will need before ovalization.

Flex Liner Oval Sizing Chart

Flex Liner Rectangle Sizing Chart

Flex Liner Rectangle Sizing Chart