4 inch x 3 inch PVC DWV Flush Bushing Fitting x Plastic

4 Inch x 3 Inch PVC DWV Flush Bushing – For Code-Compliant Pipe Reductions

The 4 inch x 3 inch PVC DWV Flush Bushing is engineered to provide a direct and secure transition between nominal 4-inch and 3-inch PVC drainage pipe in non-pressurized systems. Designed specifically for drain, waste, and vent applications, this fitting supports vertical or horizontal orientation and installs inside a 4-inch hub or socket.

Engineered for DWV System Integrity

This flush bushing is manufactured from rigid polyvinyl chloride (PVC) and complies with ASTM D2665 for DWV pipe and fittings. It maintains internal pipe alignment while reducing pipe size and preserving smooth interior flow paths to minimize potential flow restrictions and solids accumulation.

• ???? Standard Compliance Conforms to ASTM D2665 and CSA B181.2 specifications for DWV applications.
• ???? Solvent Weld Design Compatible with Schedule 40 DWV PVC systems using solvent cement welding methods.
• ???? Non-Pressure Rated Designed exclusively for gravity drainage and venting; not for pressurized water systems.
• ♻️ Lead-Free Composition Constructed from non-toxic PVC for code-mandated use in residential and commercial DWV systems.

Technical Specifications

• Nominal Sizes: 4 inch (hub) x 3 inch (spigot)
• Material: PVC (Polyvinyl Chloride)
• End Connection: Spigot x Hub (Flush insert)
• Standards: ASTM D2665, NSF 14 Certified
• Operating Temperature: Up to 140°F intermittent

Installation Considerations

Install using solvent cement in accordance with manufacturer specifications and local plumbing code. Ensure both mating surfaces are clean and properly prepared. The bushing is typically inserted into a 4-inch hub or fitting socket and accepts a 3-inch spigot or pipe. Do not use in pressurized systems or where structural load-bearing is required.

Common Applications

Typically installed in residential or light commercial DWV systems where a pipe diameter reduction is required within a cleanout riser, vertical stack, or fixture drain transition. Frequently used during system retrofits or alterations where pipe sizing must be adapted without compromising flow capacity.

Code Insight

Flush bushings must be installed so as not to impede pipe flow or introduce turbulence. Use only where system design allows for direct insertion without creating offset joints.

The 4 inch x 3 inch PVC DWV Flush Bushing is a reliable component for managing dimensional transitions in code-compliant DWV systems. Its consistent performance and dimensional stability make it suitable for new construction, repairs, or system upgrades.