4 inch PVC Sewer and Drain Bushing Fitting x Hub

4 inch PVC DWV/S&D Spigot x Hub Bushing – For Schedule 40 Drainage Transitions

The 4 inch PVC DWV/S&D Bushing (Spigot x Hub) is engineered for adapting pipe sizes in gravity-flow drainage systems. Commonly used in sanitary drain, waste, and vent (DWV) applications, this fitting transitions larger pipe hubs to smaller diameter spigots, supporting clean reductions without compromising flow alignment or code compliance.

Fabricated from rigid polyvinyl chloride (PVC) that complies with ASTM standards, this bushing is corrosion-resistant, non-conductive, and intended for use in above-ground or below-ground non-pressurized piping systems. The spigot end fits into a socket (hub) of a larger fitting, while the hub end receives a smaller-diameter pipe.

Product Specifications

• Material: PVC, typically meeting ASTM D2665 (DWV) or D3034 (Sewer & Drain)
• Size: 4 inch nominal (check manufacturer for reducer specifics)
• End Type: Spigot x Hub (SPG x HUB)
• Connection Method: Solvent weld using PVC primer and cement
• Applications: Drainage, waste, venting, and non-pressurized sewer lines

Key Performance Features

• ✅ Dimensional Compatibility – Allows for insertion into standard Schedule 40 DWV fittings for clean reduction in size.
• ✅ Code-Conforming Use – Suitable for use in systems governed by IPC and UPC where DWV transitions are needed.
• ✅ Thermal & Chemical Resistance – Inert to most acids, bases, and wastewater compositions under standard conditions.
• ✅ Ease of Fabrication – Designed for solvent-weld assembly with minimal tooling requirements.

Installation Guidance

This bushing must be installed using industry-standard solvent welding techniques. Surfaces should be clean and dry before applying primer and cement. Spigot should fully bottom in the mating hub, and sufficient cure time must be observed prior to system testing. This product is intended for use in non-pressurized systems only.

Typical Applications

Frequently specified in residential and commercial DWV systems, municipal sewer laterals, and underground storm drainage piping. It is often used in slab rough-in or foundation wall penetrations where branch pipe diameters must be reduced at entry or transition points.

Code and Regulatory Notes

Manufactured to comply with IPC, UPC, and ASTM standards applicable to PVC DWV fittings. Product use should be verified for jurisdictional approval and material compatibility where municipal sewer and drain standards differ.

The 4 inch PVC DWV/S&D SPG x HUB Bushing provides a reliable reduction fitting for gravity-drainage systems, supporting clean transitions and long-term material integrity in non-pressurized service lines.