4 inch Cast Iron Soil Service Weight Running Trap with Single Vent

4” Cast Iron Soil Running Trap – For Horizontal Drainage Applications

The 4” Cast Iron Soil Running Trap is a heavy-duty drainage fitting designed to maintain a liquid seal in horizontal waste piping systems. Constructed from cast iron in accordance with ASTM standards, this trap is commonly used in gravity-flow drainage installations where sewer gas control and long-term durability are essential.

Its robust design supports the demands of below-grade or concealed installations, where consistent performance, structural strength, and resistance to waste stream corrosion are critical. The trap is typically installed in sanitary sewer lines to retain a water barrier, reducing the passage of air and gases into occupied spaces.

Contractor-Focused Features

• ✅ High-Strength Cast Iron Body Conforms to ASTM A888 or CISPI 301 specifications for non-pressure sanitary applications.
• ✅ Engineered for Gravity Systems Provides effective siphon-breaking function in horizontal waste lines.
• ✅ Code-Compliant Design Meets applicable plumbing code requirements for sanitary drainage traps.
• ✅ Sealed Joint Configuration Compatible with no-hub couplings for secure connection to cast iron soil pipe.
• ✅ Corrosion Resistance Interior surfaces resist deterioration from wastewater and chemical exposure common in drainage systems.

Installation Notes

Installation of this running trap requires appropriate no-hub couplings or gaskets rated for cast iron soil pipe. It must be installed level to maintain trap seal depth and comply with minimum slope requirements as outlined in IPC or UPC standards. Ensure all joints are properly aligned and torqued per coupling manufacturer specifications.

Typical Use Cases

This 4” soil running trap is typically installed in underground sanitary sewer systems for commercial buildings, multifamily housing, and institutional projects. It is particularly suited for indirect waste, fixture branch lines, and main drains where uninterrupted horizontal flow must be maintained while incorporating a trap seal.

Product Note

Cast iron drainage fittings are widely used in engineered systems due to their acoustic dampening, fire-resistance, and load-bearing properties. They remain a preferred choice in fire-rated assemblies and commercial slab-on-grade or trench installations.

Technical Specifications

• Material: Cast Iron
• Nominal Size: 4 inches
• Connection Style: Soil (No-Hub)
• Standards Compliance: ASTM A888, CISPI 301, NSF/ANSI 372

The 4” Cast Iron Soil Running Trap offers long-term performance in sanitary drainage systems requiring consistent trap seal retention and corrosion resistance. Engineered for professional use, it supports code-compliant, structurally sound installations in high-traffic and below-grade environments.