Outrigger Adapter Collar — Anodized Aircraft Grade Aluminum Universal Outrigger-to-Tower, Top & Arch Adapter Collars Rupp Marine's Outrigger Adapter Collars are precision-machined from anodized aircraft grade aluminum, designed to easily adapt outriggers to towers, tops, and arches. Available in various sizes to accommodate standard pipe and tube diameters — reference the sizing chart below to confirm the correct collar for your application. Select the required size above. Important Sizing Note: Pipe dimensions are measured by inside diameter. Tube dimensions are measured by outside diameter. Reference the sizing chart below prior to ordering. Key Specifications Material: Anodized aircraft grade aluminum Application: Adapting outriggers to towers, tops, and arches Available in various sizes for standard pipe and tube diameters Pipe sizing: Measured by inside diameter Tube sizing: Measured by outside diameter Reference sizing chart below to confirm correct size Select required size above Pipe Size Clamp I.D Part Number 1.00" 1.315" 11-1130-23 1.25" 1.660" 11-1131-23 1.50" 1.90" 11-1132-23 2.00" 2.40" 11-1449-23 Tube Size Clamp I.D Part Number 1.00" 1.00" 11-1171-23 Sold individually