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Fiber Glass Systems I KSI/ P odu�tion Solutions <br /> October 10, 2016 <br /> RE : Compatibility of Red Thread TM IIA and DualoyTM Piping Products <br /> To Whom It May Concern : <br /> NOV Fiber Glass Systems has been manufacturing highly- engineered fiberglass pipe for the <br /> fuel handling industry for almost 50 years, receiving our first Underwriters Laboratories ( UL) <br /> listing in 1968 . We currently have two product lines serving the Fuel Handling market : Red <br /> Thread IIA and Dualoy ( 3000/L and 3000/LCX) . This letter addresses compatibility with <br /> current and past product generations . <br /> Red Thread IIA <br /> The Red Thread IIA piping system has been manufactured since 1990 . The system was UL <br /> listed for alcohol compatibility in 1990, and is UL-971 listed for all fuels and applications per <br /> UL Standard 971-2004 . In addition , the materials are compatible with Ethanol , Methanol , <br /> and Biodiesel blended fuels, through 100 percent concentrations . <br /> Red Thread ( manufactured and UL listed from 1968 to 1984) and Red Thread II <br /> ( manufactured and UL listed from 1984 to 1990 ) are both compatible with all ethanol fuels <br /> up to 100 percent concentration . <br /> DualoV 3000/L & 3000/ LCX <br /> The Dualoy piping systems have been manufactured since 1971 . The system was UL listed <br /> for alcohol compatibility in 1988, and is UL-971 listed for all fuels and applications per UL <br /> Standard 971-2004 . In addition , the materials are compatible with Ethanol and Methanol <br /> blended fuels, through 100 percent concentrations, and Biodiesel blended fuels . <br /> Prior to 1988, UL did not offer a Listing for alcohol blended fuels, although legacy Dualoy <br /> products prior to the Listing were compatible with ethanol and all concentrations of ethanol <br /> blended fuels . <br /> If you have any questions or require additional information , please let us know . <br /> Respectfully yours, <br /> Josh Fowler <br /> Manager, Fuel Handling Sales <br /> T 210.477.7500 17115 San Pedro Ave. <br /> M 210.278.2220 Suite 200 <br /> nov.conn/fgs San Antonio, TX 78232 <br />