O-Ring, Gas Selector, (Pack of 5) - thecryoshop.com
How to Select the Proper O-ring for Your Application - Parker´s O-Ring Selector App - YouTube
Trelleborg Sealing Solutions - Our O-Ring Selector App allows you to enter the installation specifications to quickly calculate O-Ring and housing dimensions, recommend O-Ring sizes and much more. Download our O-Ring Selector
O-Ring Size Chart
Amazon.com: Small Parts - Size Chart O-Ring Sizing Chart, Laminated, 3 Sheets, Paper and Plastic : Office Products