Sigma's weatherproof extension rings increase the capacity of a weatherproof box. The rugged， die-cast construction prevents moisture penetration making the extension rings suitable for wet， damp or dry locations. They are powder coated for corrosion resistance and include gasket and hardware.

• Brand Name: Sigma Engineered Solutions
• Work Style: New Work
• Capacity: 16.5 cu in
• Shape: Round
• Material: Metallic
• Product Type: Extension Ring
• Color: Gray
• Height: 4-3/16 in.
• Weather Resistant: Yes
• Knockout Size: 1/2 in.
• UL Listed: Yes
• Number of Knockouts: 4
• CSA Listed: Yes
• Packaging Type: Shrinkwrapped
• Diameter: 4.13 in.