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Back-Up Rings
Brand: Hi-Tech Seals IncBack-up rings are plastic or rubber rings used to prevent the O-ring from entering the clearance gap.
When high pressures are exerted on the O-ring, its soft rubber material can be forced into the clearance gap causing the O-ring to extrude.
The hard back-up ring material will keep the O-ring material from flowing into the gap which will prevent premature failure.
