WW-P-501E, FEDERAL SPECIFICATION, PIPE FITTINGS, CAST IRON, SCREWED, 125 AND 250 POUND (27 NOV 1974)
WW-P-501E, FEDERAL SPECIFICATION, PIPE FITTINGS, CAST IRON, SCREWED, 125 AND 250 POUND (27 NOV 1974)., This specification covers screwed fittings normally used with ferrous piping.
WW-P-501 Rev. E
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