Parker Seal Group
Back-up Ring 8700 Profile

Low Profile Modular Back-up for PolyPak® and U-cup Seals

Standard Materials:

  • Z4651D60
  • Z4729D65

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8700 back-ups provide added extrusion resistance to U-cups and Polypaks with only a minimal increase in gland width.These back-ups were originally designed to dramatically increase the pressure rating of rubber u-cup profiles in situations where temperature or fluid compatibility concerns prevent the use of urethane seals.As such, 8700 back-ups share a part numbering system very similar to many of our rubber u-cup profiles for easy matching of components. Additionally, they are also perfect for adding heavy duty pressure capabilities to medium duty urethane sealing systems.

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