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Plugs Overview

The Industry Benchmark for Expansion Plugs

In the 1950s, engineers searched for a more reliable and effective way to seal machined and cross-drilled holes in metal housings. In response, The Lee Company developed a plug designed to form a permanent, leak-tight seal without using O-rings, threads, or sealants. The Lee Plug® remains the best seller for The Lee Company, with well over 200 million plugs used in hydraulic systems. The Lee Company is the original OEM and the only qualified aerospace supplier for expansion plugs.

  • Lee Betaplugs are economical one-piece tapered expansion plugs developed for high-volume production applications.
  • Lee Plug Expansion Plugs offer the widest range of materials and sizes to meet the needs of a wide range of industries and applications.
  • Lee R.F.O.® Plugs are designed to seal holes in thin walls or fragile materials.
  • The Lee QIP® was developed as an evolution of the Lee Plug to provide a more straightforward method of handling and installing the smallest plug sizes.
  • A.F.O.® Plugs are both removable and reusable due to their threaded design, allowing technicians easy access to sealed passageways.
  • Lee Cross Port Plugs are a plugging solution specifically engineered to seal cross port passageways.

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An airplane, a car, and a medical device serve completely different purposes in unique environments. They require parts that are engineered specifically for the application – and we specialize in doing just that. To easily find the best solution, select your industry and see specific products that are engineered to optimize the critical system you’re working on.

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Support & Resources

Support & Resources from a Team that Speaks Your Language

Partner with The Lee Company and get much more than just a supplier of top-quality fluid control products. Our reliable technical support team is available every step of the way to help you find solutions, maximize productivity, and drive efficiency across your operations. Check out these resources tailored to your industry to learn more.