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The 3/4" NPT outlet allows <br />pressure testing of the contain- <br />ment system to a maximum <br />pressure of 10 psig. leak <br />detection devices may be <br />located in the annular space. <br />' <br />A natural flexibility allows gradual bends to be made with RED <br />THREAD II pipe. It conforms easily to gradual ditch contours. <br />RED THREAD I I pipe is inherently flexible. API Publication 1615 <br />' states: "Fiberglass piping, which is inherently flexible, does not <br />require swing joints, if at least 4 feet of straight run is provided <br />between any directional change exceeding 30°." <br />