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

4" x 4" x 1-1/2" Cast Iron Soil Wye – Engineered for Durable and Code-Compliant Drainage

The 4" x 4" x 1-1/2" Cast Iron Soil Wye is engineered for dependable performance in sanitary drainage systems. Manufactured to ASTM A888 or CISPI 301 standards, this fitting provides a reliable solution for horizontal branch line connections where flow direction and structural integrity are critical.

This triple-branch reducing wye fitting features a precision-tapped 1-1/2" branch outlet, enabling easy integration with vent or auxiliary drain lines without compromising system flow. Its hub configuration ensures compatibility with no-hub couplings and is intended for use in DWV (drain, waste, and vent) systems requiring flame- and sound-resistant material construction.

Key Technical Features

• ✅ Material: Gray cast iron for high compressive strength and longevity in subgrade or above-ground installations.
• ✅ Connection Type: Hub (no-hub) ends for use with stainless steel shielded couplings or neoprene sleeves.
• ✅ Orientation: 45° reducing branch with 1-1/2" tapped opening for cleanout, waste tie-in, or vent extensions.
• ✅ Certification: Compliant with UPC, ASTM A888, and NSF standards for non-pressure DWV systems.
• ✅ Sound Attenuation: Cast iron offers superior noise dampening compared to plastic alternatives.

Installation Guidelines

Installation of cast iron DWV fittings requires mechanical couplings rated for the specific application. Use a calibrated torque wrench to tighten stainless steel clamps to the manufacturer’s recommended torque—typically 60 in-lbs—to ensure a watertight and structurally sound connection. Adherence to local plumbing codes and system slope requirements is critical for performance and compliance.

Common Use Cases

This reducing soil wye is frequently installed in vertical stacks or horizontal branches of residential, commercial, and institutional buildings. It facilitates downstream transitions and side-entry connections in multi-fixture drainage layouts, particularly where venting or cleanout access is required.

Note on Material Selection

Cast iron is non-combustible, making it ideal for fire-rated assemblies and locations where flame spread resistance is required by code. Its rigidity also helps maintain grade alignment over long runs, minimizing joint stress.

For high-performance drainage systems that meet the strictest engineering and code requirements, the 4" x 4" x 1-1/2" Cast Iron Soil Wye delivers unmatched durability, system compatibility, and long-term reliability. Specify cast iron where quality and code compliance are non-negotiable. 🔧