All malleable iron water fittings are required to be what?

Malleable iron water fittings are required to be galvanized to protect them from corrosion and extend their durability. Galvanization involves coating the iron with a layer of zinc, which serves as a sacrificial anode. This means that the zinc will corrode before the iron does, thus helping to prevent rust and prolong the life of the fittings in water systems. Given that these fittings are often used in environments where they may be exposed to moisture, the galvanized coating is essential for maintaining the integrity and functionality of plumbing systems. Other methods like painting, polishing, or applying epoxy coatings may provide some level of protection, but galvanization is specifically mandated due to its effectiveness in ensuring the long-term performance of malleable iron fittings in plumbing applications.