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Determining the right O-Ring for the correct application can be a challenge, especially for hydraulic fittings. To simplify the issue, PIRTEK has developed a Standard O-Ring Kit designed to be used with the most popular thread forms and flanges found on equipment today.The kit contains 181 O-Rings (90 durometer) in 24 different sizes; and includes the popular sizes of Code 61 and 62 Flanges and O Ring Face Seals. A chart on the inside cover provides details of each O-Ring and its application.