- Black and Galvanized Malleable Iron—Class 150 fittings are interchangeable with black cast-iron or steel. Use in low-pressure plumbing applications including air, water, natural gas, and steam. NPT connections. Malleable Iron—Class 300 unions feature thick walls to help withstand high pressures. They are suitable for air, water, oil, natural gas, and steam. NPT threads.Forged Steel Black and Galvanized unions are thick-walled to help provide simple, economical installation. Use with water and oil in chemical, petrochemical, pulp, paper, shipbuilding, waste incineration, and semiconductor industry applications.
- These unions are ideal for use in manifold, steam, pumping, hot oil truck, low, and high pressure applications.
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