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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 /> f i ' <br /> r <br /> r. <br /> 1., <br /> r <br /> ti <br /> 0 <br /> :r <br /> i <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 II pipe is inherently flexible. API Publication <br /> 1615/87 states: "FRP piping, which is inherently flexible, can be <br /> used to create its own flexible joint if at least 4 feet of straight run <br /> is provided between any directional changes of more than 30 <br /> degrees." <br /> 5 <br />