Fire and Water Tube Expanders Three Roll-Parallel Expanding-Straight Roll Type – 2” to 3-1/2” Outer Diameter Four Roll-Parallel Expanding-Straight Roll Type – 2” to 3” Outer Diameter Four Roll-Parallel Expanding-Double Flare Roll Type – 2” to 4-1/2” Outer Diameter Three Roll-Parallel Expanding-Single Flare Roll Type – 1” to 1-3/4” Outer Diameter
