4 inch x 4 inch x 1-1/2 inch Cast Iron Soil Reducing Tapped Wye No Hub x No Hub x No Hub

4 inch x 1-1/2 inch Cast Iron Tapped Tee – No-Hub Soil Pipe Fitting, DWV Rated

The 4 inch x 1-1/2 inch Cast Iron Soil Tapped Tee is a no-hub fitting used in drain, waste, and vent (DWV) systems for creating a reducing branch connection. Manufactured by Charlotte Pipe, this fitting is engineered for joining 4-inch horizontal or vertical runs to a 1-1/2-inch branch, typically to accommodate fixture connections in soil stack assemblies or waste lines.

This fitting is cast from ASTM A888-compliant gray cast iron and includes a tapped side outlet designed for threaded or no-hub connections, depending on configuration. It is intended for non-pressure DWV piping systems and is suitable for use in above- and below-grade installations in residential, commercial, and institutional plumbing systems.

Product Features

• ✅ Material: Gray Cast Iron per ASTM A888
• ✅ Nominal Size: 4 inch x 1-1/2 inch
• ✅ Connection Type: No-Hub (meets CISPI 301 and ASME B1.20.1 for threaded outlet if specified)
• ✅ Application: Soil, waste, and vent piping in gravity-flow systems
• ✅ Fire Resistance: Non-combustible and rated for fire-stopping assemblies per model building codes

Installation Guidelines

Installed using no-hub couplings conforming to ASTM C1277 or CISPI 310. Couplings should be torqued with a calibrated torque wrench to manufacturer specifications (typically 60 in-lbs). Ensure proper alignment of piping before securing clamps. This fitting is compatible with standard hubless cast iron piping and meets UPC and IPC code requirements.

Common Use Cases

Commonly found in vertical and horizontal soil stack configurations, this fitting is used to create a reduced branch take-off from a 4 inch main. It is frequently used in multi-story residential and commercial buildings to transition from stack to fixture drain lines, where noise control and structural integrity are priorities.

Material Characteristics

Cast iron provides excellent durability, resistance to thermal distortion, and superior acoustic performance when compared to plastic DWV alternatives. It is often selected for high-rise or institutional plumbing systems due to its longevity and fire-resistance properties.

Technical Summary

• Manufacturer: Charlotte Pipe
• Material: Cast Iron (ASTM A888)
• Nominal Sizes: 4 inch x 1-1/2 inch
• Outlet Type: Tapped side branch
• Connection Type: No-Hub (w/ optional threaded branch)
• Certifications: UPC Listed, NSF certified, ASTM A888, CISPI compliant

The 4 inch x 1-1/2 inch Cast Iron Soil Tapped Tee provides a code-compliant solution for reducing branch transitions in DWV systems. Its robust construction and sound attenuation properties make it an optimal choice for high-performance drainage layouts in both new construction and retrofit applications.