PAI Kurv-Bak™ hard rubber back-up rings can be made in a variety of materials to help prevent early seal failure at higher pressures.
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Item #

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Thickness (Inches)

I.D. (inches)

O.D. (Inches)

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N/A 1/4 N/A 4 N/A 4 1/2 N/A .117 N/A 4.044 N/A 4.516
N/A 1/4 N/A 3 1/2 N/A 4 N/A .117 N/A 3.544 N/A 4.016
N/A 1/4 N/A 3 1/4 N/A 3 3/4 N/A .117 N/A 3.294 N/A 3.766
N/A 1/4 N/A 3 N/A 3 1/2 N/A .117 N/A 3.034 N/A 3.506
N/A 1/4 N/A 2 1/2 N/A 3 N/A .117 N/A 2.534 N/A 3.006
N/A 1/4 N/A 2 N/A 2 1/2 N/A .117 N/A 2.034 N/A 2.506
N/A 1/4 N/A 1 7/8 N/A 2 3/8 N/A .117 N/A 1.909 N/A 2.381
N/A 1/4 N/A 1 3/4 N/A 2 1/4 N/A .117 N/A 1.784 N/A 2.256
N/A 1/4 N/A 1 5/8 N/A 2 1/8 N/A .117 N/A 1.659 N/A 2.131
N/A 3/16 N/A 7 3/4 N/A 8 1/8 N/A .076 N/A 6.528 N/A 6.894
N/A 3/16 N/A 23 N/A 23 3/8 N/A .076 N/A 22.993 N/A 23.359
N/A 3/16 N/A 16 N/A 16 3/8 N/A .076 N/A 16.008 N/A 16.374
N/A 3/16 N/A 15 N/A 15 3/8 N/A .076 N/A 15.028 N/A 15.394
N/A 3/16 N/A 14 N/A 14 3/8 N/A .076 N/A 13.975 N/A 14.341
N/A 3/16 N/A 13 N/A 13 3/8 N/A .076 N/A 13.028 N/A 13.394
N/A 3/16 N/A 11 1/2 N/A 11 7/8 N/A .076 N/A 11.528 N/A 11.894
N/A 3/16 N/A 11 N/A 11 3/8 N/A .076 N/A 11.028 N/A 11.394
N/A 3/16 N/A 9 1/4 N/A 9 5/8 N/A .076 N/A 9.278 N/A 9.644
N/A 3/16 N/A 8 3/4 N/A 9 1/8 N/A .076 N/A 8.778 N/A 9.145
N/A 3/16 N/A 8 1/2 N/A 8 7/8 N/A .076 N/A 8.528 N/A 8.894
N/A 3/16 N/A 8 1/4 N/A 8 5/8 N/A .076 N/A 8.278 N/A 8.644
N/A 3/16 N/A 8 N/A 8 3/8 N/A .076 N/A 8.028 N/A 8.394
N/A 3/16 N/A 7 1/2 N/A 7 7/8 N/A .076 N/A 7.528 N/A 7.894
N/A 3/16 N/A 7 N/A 7 3/8 N/A .076 N/A 7.028 N/A 7.394
N/A 3/16 N/A 6 3/4 N/A 7 1/8 N/A .076 N/A 6.778 N/A 7.144
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