O-Rings
Saite identifies O-rings in its own product classification; request the actual compound and cross-section rather than inferring a material from the photograph.
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The company separately lists seals for transformer switches; confirm the equipment drawing and contact conditions for the proposed component.
Provide the groove or component drawing, medium, temperature, movement and existing part reference where available. Request the proposed seal construction and compound information so the selection can be assessed against the actual mating parts and operating duty. Request the current catalogue or drawing for this item, and confirm the offered configuration and supporting documents with the company before specifying an order.