4 inch Cast Iron Soil Service Weight 1/4 Bend Hub x Soil

4" Cast Iron Service Weight 1/4 Bend – Hub x Hub for DWV Systems

The 4" Cast Iron Service Weight 1/4 Bend is a quarter-turn fitting used in cast iron DWV (Drain, Waste, and Vent) systems to redirect flow by 90 degrees. Fabricated to meet ASTM A74 specifications, this fitting features hub x hub ends and is suitable for use in non-pressure sanitary drainage applications.

Service weight cast iron is the standard for institutional, commercial, and multi-family construction where structural strength, acoustic control, and fire resistance are critical. The 1/4 bend configuration offers smooth directional flow with minimal turbulence, supporting long-term performance in vertical or horizontal runs.

Product Highlights

• Size: 4 inches nominal
• Connection Type: Hub x Hub
• Material: Gray cast iron (ASTM A74 compliant)
• Fitting Type: 90-degree 1/4 bend

Performance Advantages

• Mechanical Strength: Cast iron resists deflection, impact, and deformation under load, making it ideal for underground and above-ground installations.
• Acoustics: Naturally quiet, cast iron reduces sound transmission in waste and vent systems—ideal for multi-floor commercial or residential buildings.
• Fire Resistance: Non-combustible material helps meet fire rating requirements in wall and floor penetrations.
• Dimensional Stability: Tight manufacturing tolerances ensure consistent alignment and leak-resistant joints when properly joined.

Application Guidance

This fitting is most commonly used in soil stacks, vent offsets, and horizontal to vertical transitions in DWV systems. It is designed for use with service weight cast iron pipe using lead and oakum or compression gasket joints. Ensure pipe is properly supported according to code requirements to maintain joint integrity over time.

Installation Notes

Cut and clean pipe ends thoroughly prior to assembly. Use a mechanical joiner (ASTM C564 gasket) or traditional lead and oakum for hub connections. Follow local and national plumbing codes such as the UPC or IPC for layout and spacing.

Specification Compliance

• ASTM A74 – Cast Iron Soil Pipe and Fittings
• NSF/ANSI 372 – Lead Content Certification
• Complies with standard DWV building codes

The 4" Cast Iron Service Weight 1/4 Bend is a staple in engineered DWV systems where durability, compliance, and structural integrity are non-negotiable. An essential component for gravity drainage assemblies in both new construction and retrofits.