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What is the difference between tubing and casing? Tubing is used to transport oil or gas and casing insulators protect these tubes. The casing pipeline keeps the main pipe safe. When the pipelines are crossing through any barrier, a link seal helps to seal the penetration. The end seal helps to ensure that nothing enters between the space between a carrier pipe (tubing) and a casing pipe. Link seal is oil, gas, fire, and extreme temperature resistant.