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O-rings are solid-rubber seals with a round shape (O-shaped) cross section. O-rings are used to block the passage of liquid or gases, when pressed between two mating surfaces. They can either form static or dynamic seals. A seal is called static when the O-ring does not move; whereas dynamic seals can be reciprocating (like a piston and cylinder), or rotating.

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Custom Fabricated O-rings Specialty Products' o-rings are designed for use in critical sealing applications. Brass Oil Level Sight Glasses The sight glasses are highly stable and scratch proof. Elastomer O-Rings are not your only option Elastomer O-Rings are a common choice for sealing within semiconductor equipment. Apple Rubber Products Offers Medical-Grade Elastomers Medical-grade elastomers such as Viton ® fluoroelastomer (FKM) and EPDM rubber for medical applications. Unlimited O-Rings Apple Rubber stocks standard sizes for quick ship, plus countless other custom O-Rings with express service available.