Specifications:
Height: 36″ Diameter: 3.5″ OD Weight: 30 lbs. Wall Thickness: .216
Height: 36″ Diameter: 4.5″ OD Weight: 40 lbs. Wall Thickness: .237
Height: 36″ Diameter: 4.5″ OD Weight: 70 lbs. Wall Thickness: .280
U.S. Patents 7,472,891 & 7,722,285, Canadian Patents 2,623,426 & 2,727,833
US PATENTS 8,297,873