... to convey gas,water,and oil. Galvanized Water Malleable Iron Pipe Fittings:1.standard: EN10242,ISO7-1 ,NPT 2.banded ... , unions, crosses, flanges, plugs, backnuts, crosses over, round caps, etc.Size18"-6"Thread StandardBS ANSI & DINFinishBlack, Eclectic Galvanized, ... , good antirust propertyProduct UsageSuitable for joining pipe lines of team, gas, oil, air Galvanized Water Malleable Iron Pipe Fittings