Description: 1. Material: Our black couplings are made of malleable cast iron, and sprayed with black coating. They have the characteristics of high strength, toughness, durability, pressure resistance, corrosion resistance, and long service life. 2.
Description: 1. Material: Our black couplings are made of malleable cast iron, and sprayed with black coating. They have the characteristics of high strength, toughness, durability, pressure resistance, corrosion resistance, and long service life. 2.
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