"O-rings" (O-rings) is a rubber seal with a circular section, because of its O-shaped section, it is called an O-shaped rubber seal, also known as an O-ring. It began to appear in the mid-19th century, when it was used as a sealing element for steam engine cylinders.
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BKO rings are special O-ring rings made of polyester resin or special PTFE resin. It must be used with O-rings and cannot be used alone.
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The BKU ring is a special U-shaped ring made of polyester resin or special PTFE resin. Use with U-ring, not alone. A bevel cut retaining ring is available for easy installation.
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