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 3/16 N/A 3 N/A 3 3/8 N/A .076 N/A 3.018 N/A 3.384
N/A 3/32 N/A 3 1/4 N/A 3 7/16 N/A .053 N/A 3.268 N/A 3.440
N/A 1/8 N/A 3 1/4 N/A 3 1/2 N/A .050 N/A 3.256 N/A 3.492
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 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 1/8 N/A 3 3/8 N/A 3 5/8 N/A .050 N/A 3.381 N/A 3.617
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 3/32 N/A 3 1/2 N/A 3 11/16 N/A .053 N/A 3.518 N/A 3.690
N/A 1/8 N/A 3 1/2 N/A 3 3/4 N/A .050 N/A 3.506 N/A 3.742
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 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 1/8 N/A 3 5/8 N/A 3 7/8 N/A .050 N/A 3.631 N/A 3.867
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 3/32 N/A 3 3/4 N/A 3 15/16 N/A .053 N/A 3.768 N/A 3.940
N/A 1/8 N/A 3 3/4 N/A 4 N/A .050 N/A 3.756 N/A 3.992
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 1/4 N/A 3 1/2 N/A 4 N/A .117 N/A 3.544 N/A 4.016
N/A 1/8 N/A 3 7/8 N/A 4 1/8 N/A .050 N/A 3.881 N/A 4.117
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 3/32 N/A 4 N/A 4 3/16 N/A .053 N/A 4.018 N/A 4.190
N/A 1/8 N/A 4 N/A 4 1/4 N/A .050 N/A 4.006 N/A 4.242
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 1/8 N/A 4 1/8 N/A 4 3/8 N/A .050 N/A 4.131 N/A 4.367
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 3/32 N/A 4 1/4 N/A 4 7/16 N/A .053 N/A 4.268 N/A 4.440
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