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)

Sort by
N/A 1/8 N/A 4 1/4 N/A 4 1/2 N/A .050 N/A 4.256 N/A 4.492
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 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 1/8 N/A 4 3/8 N/A 4 5/8 N/A .050 N/A 4.381 N/A 4.617
N/A 1/16 N/A 4.5 N/A 4 5/8 N/A .049 N/A 4.518 N/A 4.624
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 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 3/32 N/A 4.5 N/A 4 11/16 N/A .053 N/A 4.518 N/A 4.690
N/A 1/8 N/A 4.5 N/A 4 3/4 N/A .050 N/A 4.506 N/A 4.742
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 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 1/8 N/A 4 5/8 N/A 4 7/8 N/A .050 N/A 4.631 N/A 4.867
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 3/16 N/A 4.5 N/A 4 7/8 N/A .076 N/A 4.528 N/A 4.894
N/A 3/32 N/A 4 3/4 N/A 4 15/16 N/A .053 N/A 4.768 N/A 4.940
N/A 1/8 N/A 4 3/4 N/A 5 N/A .050 N/A 4.768 N/A 5.004
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 1/4 N/A 4.5 N/A 5 N/A .117 N/A 4.551 N/A 5.023
N/A 1/8 N/A 4 7/8 N/A 5 1/8 N/A .050 N/A 4.893 N/A 5.129
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 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 3/32 N/A 5 N/A 5 3/16 N/A .053 N/A 5.018 N/A 5.190
N/A 1/8 N/A 5 N/A 5 1/4 N/A .050 N/A 5.018 N/A 5.254
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 1/4 N/A 4 3/4 N/A 5 1/4 N/A .117 N/A 4.801 N/A 5.273
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