The Pipe Line Development Company – PLIDCO was founded in 1949 by Joseph B. and Berneice K. Smith.

We manufacture hundreds of thousands of pipeline leak repair and maintenance fittings that are sold and installed safely and reliably around the world. Our Northeast Ohio factory offers nearly 248,200 square feet of office and manufacturing space and employs approximately 100 pipeline repair professionals.

Applications for PLIDCO Pipeline Fittings

PLIDCO pipeline fittings have been used for high pressure emergency pipeline repairs and routine pipeline maintenance in a wide variety of applications, both onshore and subsea. Applications include oil, gas, water, chemical, steam, slurry and other piping systems. Our high pressure fittings are designed and manufactured following the ASME/ANSI applicable codes and adhere to our strict Quality Control program.

Benefits of PLIDCO Pipeline Products

Our proven products have enabled customers to avoid or minimize costly shutdown times, while keeping staff and the environment safe. Our bolted products seal the leak as soon as these are torqued to the proper specifications, allows it to be back-welded while the line is in operation or bolted-only for non-weld pipeline repair. Factory trained technicians are available to assist you with difficult installations or with measurements for special designs.


Our active Research and Development Department is always working on new and innovative solutions to aid the emergency pipeline repair and maintenance industry. PLIDCO® is ISO 9001 certified.

Always Available to Help

On call 24 hours a day, 365 days a year, our sales technicians are ready to provide solutions and technical assistance, as PLIDCO partners have offices located around the world to respond to any hazardous pipeline repairs.

Trust the Original. Trust PLIDCO.

We work each day to earn our customers’ trust. We are the only provider in the industry to offer a 5-year limited warranty on our pipeline repair and maintenance fittings.

September 25, 2023 in Company News

PLIDCO Launches New Line of Hydrogen-Compatible Fittings

PLIDCO Launches New Line of Hydrogen-Compatible Fittings Learn more at the ADIPEC 2023 Exhibition & Conference    CLEVELAND , Ohio – September 25, 2023 – The Pipe Line Development Company (PLIDCO), the leader in pipeline leak repair and maintenance fittings, announced today the…
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Plidco Overview Video:

PLIDCO has been manufacturing emergency pipeline and maintenance fittings for more than 70 years. Our safe, quality products are trusted on pipeline repairs around the globe.

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Trust the Original. Trust PLIDCO.