• Kurv-Baks
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)

N/A 3/16 N/A 2 3/8 N/A 2 3/4 N/A .076 N/A 2.393 N/A 2.759
N/A 3/16 N/A 2 1/2 N/A 2 7/8 N/A .076 N/A 2.518 N/A 2.884
N/A 3/16 N/A 2 5/8 N/A 3 N/A .076 N/A 2.643 N/A 3.009
N/A 3/16 N/A 2 3/4 N/A 3 1/8 N/A .076 N/A 2.768 N/A 3.134
N/A 3/16 N/A 2 7/8 N/A 3 1/4 N/A .076 N/A 2.893 N/A 3.259
N/A 3/16 N/A 3 N/A 3 3/8 N/A .076 N/A 3.018 N/A 3.384
N/A 3/16 N/A 3 1/8 N/A 3 1/2 N/A .076 N/A 3.143 N/A 3.509
N/A 3/16 N/A 3 1/4 N/A 3 5/8 N/A .076 N/A 3.273 N/A 3.639
N/A 3/16 N/A 3 3/8 N/A 3 3/4 N/A .076 N/A 3.398 N/A 3.764
N/A 3/16 N/A 3 1/2 N/A 3 7/8 N/A .076 N/A 3.523 N/A 3.889
N/A 3/16 N/A 3 5/8 N/A 4 N/A .076 N/A 3.648 N/A 4.014
N/A 3/16 N/A 3 3/4 N/A 4 1/8 N/A .076 N/A 3.773 N/A 4.139
N/A 3/16 N/A 3 7/8 N/A 4 1/4 N/A .076 N/A 3.898 N/A 4.264
N/A 3/16 N/A 4 N/A 4 3/8 N/A .076 N/A 4.028 N/A 4.394
N/A 3/16 N/A 4 1/8 N/A 4 1/2 N/A .076 N/A 4.153 N/A 4.519
N/A 3/16 N/A 4 1/4 N/A 4 5/8 N/A .076 N/A 4.278 N/A 4.644
N/A 3/16 N/A 4 3/8 N/A 4 3/4 N/A .076 N/A 4.403 N/A 4.769
N/A 3/16 N/A 4 5/8 N/A 5 N/A .076 N/A 4.653 N/A 5.019
N/A 3/16 N/A 4 3/4 N/A 5 1/8 N/A .076 N/A 4.778 N/A 5.144
N/A 3/16 N/A 4 7/8 N/A 5 1/4 N/A .076 N/A 4.903 N/A 5.269
N/A 3/16 N/A 4.5 N/A 4 7/8 N/A .076 N/A 4.528 N/A 4.894
N/A 3/16 N/A 5 N/A 5 3/8 N/A .076 N/A 5.028 N/A 5.394
N/A 3/16 N/A 5 1/8 N/A 5 1/2 N/A .076 N/A 5.153 N/A 5.519
N/A 3/16 N/A 5 1/4 N/A 5 5/8 N/A .076 N/A 5.278 N/A 5.644
N/A 3/16 N/A 5 3/8 N/A 5 3/4 N/A .076 N/A 5.403 N/A 5.769
N/A 3/16 N/A 5 1/2 N/A 5 7/8 N/A .076 N/A 5.528 N/A 5.894
N/A 3/16 N/A 5 5/8 N/A 6 N/A .076 N/A 5.653 N/A 6.019
N/A 3/16 N/A 5 3/4 N/A 6 1/8 N/A .076 N/A 5.778 N/A 6.144
N/A 3/16 N/A 5 7/8 N/A 6 1/4 N/A .076 N/A 5.903 N/A 6.269
N/A 3/16 N/A 6 N/A 6 3/8 N/A .076 N/A 6.028 N/A 6.394
N/A 3/16 N/A 6 1/4 N/A 6 5/8 N/A .076 N/A 6.278 N/A 6.644
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
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 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 3/4 N/A 8 1/8 N/A .076 N/A 6.528 N/A 6.894
N/A 3/16 N/A 7 3/4 N/A 8 1/8 N/A .053 N/A 7.778 N/A 8.144
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 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 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 3/4 N/A 9 1/8 N/A .076 N/A 8.778 N/A 9.145
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 11 N/A 11 3/8 N/A .076 N/A 11.028 N/A 11.394
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 13 N/A 13 3/8 N/A .076 N/A 13.028 N/A 13.394
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 15 N/A 15 3/8 N/A .076 N/A 15.028 N/A 15.394
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 23 N/A 23 3/8 N/A .076 N/A 22.993 N/A 23.359
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 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 7/8 N/A 2 3/8 N/A .117 N/A 1.909 N/A 2.381
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 2 1/2 N/A 3 N/A .117 N/A 2.534 N/A 3.006
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 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 1/2 N/A 4 N/A .117 N/A 3.544 N/A 4.016
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 4 1/8 N/A 4 5/8 N/A .117 N/A 4.169 N/A 4.641
N/A 1/4 N/A 4 1/4 N/A 4 3/4 N/A .117 N/A 4.294 N/A 4.766
N/A 1/4 N/A 4 3/8 N/A 4 7/8 N/A .117 N/A 4.419 N/A 4.891
N/A 1/4 N/A 4 3/4 N/A 5 1/4 N/A .117 N/A 4.801 N/A 5.273
N/A 1/4 N/A 4 7/8 N/A 5 3/8 N/A .117 N/A 4.926 N/A 5.398
N/A 1/4 N/A 4.5 N/A 5 N/A .117 N/A 4.551 N/A 5.023
N/A 1/4 N/A 5 N/A 5 1/2 N/A .117 N/A 5.051 N/A 5.523
N/A 1/4 N/A 5 1/8 N/A 5 5/8 N/A .117 N/A 5.176 N/A 5.648
N/A 1/4 N/A 5 1/4 N/A 5 3/4 N/A .117 N/A 5.301 N/A 5.773
N/A 1/4 N/A 5 3/8 N/A 5 7/8 N/A .117 N/A 5.426 N/A 5.898
N/A 1/4 N/A 5 1/2 N/A 6 N/A .117 N/A 5.551 N/A 6.023
N/A 1/4 N/A 5 5/8 N/A 5 1/8 N/A .117 N/A 4.676 N/A 5.148
N/A 1/4 N/A 5 5/8 N/A 6 1/8 N/A .117 N/A 5.676 N/A 6.148
N/A 1/4 N/A 5 3/4 N/A 6 1/4 N/A .117 N/A 5.801 N/A 6.273
N/A 1/4 N/A 5 7/8 N/A 6 3/8 N/A .117 N/A 5.926 N/A 6.398
N/A 1/4 N/A 6 N/A 6 1/2 N/A .117 N/A 6.051 N/A 6.523
N/A 1/4 N/A 6 1/4 N/A 6 3/4 N/A .117 N/A 6.274 N/A 6.746
N/A 1/4 N/A 6 1/2 N/A 7 N/A .117 N/A 6.524 N/A 6.996
N/A 1/4 N/A 6 3/4 N/A 7 1/4 N/A .117 N/A 6.774 N/A 7.246
N/A 1/4 N/A 7 N/A 7 1/2 N/A .117 N/A 7.024 N/A 7.496
N/A 1/4 N/A 7 1/4 N/A 7 3/4 N/A .117 N/A 7.274 N/A 7.746
N/A 1/4 N/A 7 1/2 N/A 8 N/A .117 N/A 7.524 N/A 7.996
N/A 1/4 N/A 7 3/4 N/A 8 1/4 N/A .117 N/A 7.774 N/A 8.246
N/A 1/4 N/A 8 N/A 8 1/2 N/A .117 N/A 8.024 N/A 8.496
N/A 1/4 N/A 8 1/2 N/A 9 N/A .117 N/A 8.524 N/A 8.996
N/A 1/4 N/A 9 N/A 9 1/2 N/A .117 N/A 9.024 N/A 9.496
N/A 1/4 N/A 9 1/2 N/A 10 N/A .117 N/A 9.524 N/A 9.996
N/A 1/4 N/A 10 N/A 10 1/2 N/A .117 N/A 10.024 N/A 10.496
N/A 1/4 N/A 10 1/2 N/A 11 N/A .117 N/A 10.524 N/A 10.996
N/A 1/4 N/A 11 N/A 11 1/2 N/A .117 N/A 11.024 N/A 11.496
N/A 1/4 N/A 11 1/2 N/A 12 N/A .117 N/A 11.524 N/A 11.996
N/A 1/4 N/A 12 N/A 12 1/2 N/A .117 N/A 12.024 N/A 12.496
N/A 1/4 N/A 12 1/2 N/A 13 N/A .117 N/A 12.524 N/A 12.996
N/A 1/4 N/A 13 N/A 13 1/2 N/A .117 N/A 13.024 N/A 13.496
N/A 1/4 N/A 13 1/2 N/A 14 N/A .117 N/A 13.524 N/A 13.996
N/A 1/4 N/A 14 N/A 14 1/2 N/A .117 N/A 14.024 N/A 14.496
N/A 1/4 N/A 14 1/2 N/A 15 N/A .117 N/A 14.524 N/A 14.996
N/A 1/4 N/A 15 N/A 15 1/2 N/A .117 N/A 15.024 N/A 15.496
N/A 1/4 N/A 15 1/2 N/A 16 N/A .117 N/A 15.524 N/A 15.996
N/A 1/4 N/A 16 N/A 16 1/2 N/A .117 N/A 16.004 N/A 16.476
N/A 1/4 N/A 16 1/2 N/A 17 N/A .117 N/A 16.504 N/A 16.976
N/A 1/4 N/A 17 N/A 17 1/2 N/A .117 N/A 17.004 N/A 17.476
N/A 1/4 N/A 17 1/2 N/A 18 N/A .117 N/A 17.504 N/A 17.976
N/A 1/4 N/A 18 N/A 18 1/2 N/A .117 N/A 18.004 N/A 18.476
N/A 1/4 N/A 18 1/2 N/A 19 N/A .117 N/A 18.504 N/A 18.976
N/A 1/4 N/A 19 N/A 19 1/2 N/A .117 N/A 19.004 N/A 19.476
N/A 1/4 N/A 19 1/2 N/A 20 N/A .117 N/A 19.504 N/A 19.976
N/A 1/4 N/A 20 N/A 20 1/2 N/A .117 N/A 20.004 N/A 20.476
N/A 1/4 N/A 21 N/A 21 1/2 N/A .117 N/A 21.004 N/A 21.476
N/A 1/4 N/A 22 N/A 22 1/2 N/A .117 N/A 22.004 N/A 22.476
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