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Backup Rings Buna Size 438 Price for 1 pc
Original price was: $2.40.$0.72Current price is: $0.72.
Backup Rings
Size#438 – 6-1/4 ID x 6-3/4 OD x 1/4 CS
Back-up rings are used in conjunction with O-ring for both static and dynamic sealing applications.
They prevent extrusion of the O-ring when it is subjected to high pressures, or when the extrusion gaps are excessive.
Wherever possible two Back-up rings should be used, one on each side of the O-ring.
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