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Register here Sign inOur Red Thread™ IIA piping systems are UL-971 listed for all UL-identified applications and fuels, including alcohol and alcohol-gasoline mixtures of either ethanol or methanol up to and including 100%. The piping system is compatible with biodiesel and E85 fuels.
Red Thread IIA Series piping costs 63% less than 2-in. coaxial flexible pipe and 46% less than 1½-in. coaxial flexible pipe. Red Thread IIA Series piping also costs 20% less than Red Thread IIA traditional/parallel layout piping.
30-year warranty
With more than 50 years of proven performance in the marketplace, UL-971 Listed Red Thread IIA pipe, fittings, and adhesive carry a 30-year warranty. The product is warrantied to be free from defects in material and workmanship and against internal and external corrosion when used for underground transportation of fuels.
Leak prevention
UL-971 bonded sump entry fittings provide a positive seal at the sump, preventing leaking of underground fuel in or out of the sump. Our Bonded Sump Entry Fitting–Termination Style also provides Class I protection, which complies with California’s requirement for continuous interstitial monitoring of the piping systems’ secondary containment.
StationWare 3000
StationWare 3000 is a standalone CAD program that provides a professional-looking station layout drawing and an accurate bill of materials for the site.
Secondary Containment
When secondary containment is needed, Red Thread IIA provides a true pipe-in-a-pipe system. Containment pipe is identical to the primary pipe. Sections are joined together with matching two-piece clamshells that are bonded and bolted together. One-half of the clamshell fitting is prefitted with female-threaded fasteners to make assembly fast and easy from one side of the fitting.
Sump Fittings
- Bonded Sump Entry
- Double-Wall Sump Entry
- Gasketed Sump Entry/Termination
- UL-971 Sump Fitting
Red Thread IIA Fiberglass Pipe Specifications
Red Thread IIA primary pipe | |
Size range | 2- to 4-in. UL listed |
Inner corrosion barrier | Resin-rich |
Pressure ratings | Up to 250 psig |
Construction | Filament wound with amine-cured epoxy resins and fiberglass roving |
Red Thread IIA secondary pipe | |
Size range | 3- to 6-in. UL listed |
Inner corrosion barrier | Resin-rich |
Pressure ratings | Up to 50 psig |
Temperature range | Up to 150 °F (65 °C) |
Fittings | Threaded and bonded (TAB) or bell and spigot |
Chemical service | Petroleum products, alcohols, alcohol-gasoline mixtures, ethanol, methanol, MTBE, diesel exhaust fluid |
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Red Thread IIA Data Sheet
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Red Thread IIA Primary Fittings Data Sheet
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Red Thread IIA Piping System Spec Sheet
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Red Thread IIA Piping System Spec Sheet (Spanish)
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Red Thread IIA Riser Pipe Testing and Technical Guidance Spec Sheet
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Bonded Sump Entry Fitting (Termination Style) Spec Sheet
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Sump/Entry Termination Fitting with Gasket Spec Sheet
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Sump/Entry Termination Fitting with Gasket Spec Sheet (Spanish)
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30-Year Warranty on Fuel Handling Products Flyer
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Bonded Sump Entry Fitting Instructions Flyer
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Split Sump Entry Fitting Instructions Flyer
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Chemical-Industrial Distribution List
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Fiberglass Engineering and Piping Design Guide
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Corrosion Resistant Fiberglass Piping Systems Brochure Russian
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Corrosion Resistant Fiberglass Piping Systems Brochure Spanish
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Corrosion Resistant Fiberglass Piping Systems Brochure Chinese
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Corrosion Resistant Fiberglass Piping Systems Brochure
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Fuel Handling Piping Systems Brochure
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Fuel Handling Piping Systems Brochure (Spanish)
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Red Thread IIA (RTIIA) Riser Pipe Assembly Flyer
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Tank Battery Piping Systems Flyer
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Pompano Beach Plaza (Florida) Case Study
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Service Station in Little Rock (Arkansas) Case Study (Spanish)
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The Effect of Continual Gasoline Dispensing Line Service on Fiberglass Case Study
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The Effect of Continual Gasoline Dispensing Line Service on Fiberglass Case Study (Spanish)
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UL/ULC Listed Red Thread Pipe (Texas) Case Study
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UL/ULC Listed Red Thread Pipe (Texas) Case Study (Spanish)


50 years of UL-listed piping
With 50 years since the first UL-listed approval, our Red Thread IIA fiberglass pipe and fittings are the most reliable choice for your composite underground fuel handling needs.