Caps

Ductile Iron Pipe Caps

Ductile iron caps deliver superior durability for water mains, sewer systems, and industrial applications where corrosion resistance and long-term reliability matter. Unlike brittle cast iron, ductile iron maintains structural integrity through decades of service - with service life often exceeding 50–100 years when properly installed. Our ductile iron fittings are engineered to NSF/ANSI standards for potable water and sewerage applications.

All caps meet ANSI/AWWA pressure-temperature ratings and are sized to B16.9 standards in Schedule 40, 80, and XS grades to match your system's working pressure. Each cap includes a standard 100 psi surge allowance for pump transients and water hammer events. Contractors also rely on ductile iron caps for fire protection systems, gas distribution networks, and industrial process lines where failure isn't an option. FM-UL certifications are available for fire suppression applications requiring high impact resistance and vibration tolerance.

Installation is straightforward - no special grouting or complex schedules required. Ductile iron caps integrate seamlessly with mechanical joint couplings, flanged connections, or grooved systems. For demanding deep trench installations exceeding 100 feet, ductile iron's exceptional ring strength handles external soil loads and beam loading that would crush weaker materials. Restrained joint options are available for trenchless applications like horizontal directional drilling. Shop pressure caps, mechanical caps, and specialty fittings for your next project - free shipping on orders over $99.