- Malleable Iron cap fittings feature thicker walls that can withstand higher pressures than class 150 fittings. Models are suitable for air, water, oil, natural gas, and steam. Use with properly rated nipples.Forged Steel Black and Galvanized cap fittings offer you a simple, economical installation solution for use with water and oil in chemical, petrochemical, pulp, paper, shipbuilding, waste incineration, and semiconductor industry applications.Black and Galvanized Malleable Iron fittings are interchangeable with black cast-iron or steel. Use in low-pressure plumbing applications including air, water, natural gas, and steam.
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