Discover premium quality malleable iron pipe couplings at our plant, adhering to ANSI B16.3 and ASME B16.3 standards, featuring ANSI B1.20.1 and ASME B1.20.1 specifications, including Figure 220 design with NPT threads. Our 6-inch couplings are hot dip galvanized for durability, measuring 11.04 CM in length.