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Marshall Excelsior Full Flow POL Adapter. The ME318P POL Adapter is machined of solid brass. The 1/4 inch male pipe fitting fits the inlet of all standard low pressure regulators. The POL nut features a left hand thread and fits all standard LP gas cylinder valves. Caution: when installing the 1/4 inch Male NPT into regulator inlet, it is recommended that Teflon tape be used instead of the thread Sealant If thread sealant is used, extremecaution should be taken that no thread sealant gets in the regulator inlet. FF POL x 1/4 inch Male Pipe Thread assembly, 7/8 inch hex nut.