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Description
Back-up rings fit between O-rings and extrusion gaps to prevent the O-ring from extruding. Two back-up rings are often used (one on each side of O-ring) to prevent extrusion from either side based on direction of pressure.
| Application | O-rings/seals with high pressures, large extrusion gaps, and/or high temperatures. | Inside Diameter | 3.898'' | Width | 0.183'' |
| Material | BUNA | Thickness | 0.076'' |
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