4 x 3 in. PVC Schedule-40 DWV Reducing Busher/Bushing/Ring Reducer for Drain, Waste & Vent Pipe Fitting ASTM D2665 NSF 4" Spigot x 3" SLIP/HUB

The 247Garden 4 x 3 in. PVC Schedule-40 DWV Reducing Bushing—also known as a busher or reducer ring—is a compact, high-performance fitting designed to reduce a 4-inch drain, waste, and vent (DWV) pipe to a 3-inch hub connection. Built from durable white PVC and engineered to meet ASTM D2665 and NSF standards, this fitting offers a clean and secure transition point in both residential and commercial plumbing systems.

This reducer features a 4-inch spigot end that fits directly into a standard 4-inch DWV hub or fitting and a 3-inch slip (hub) end that accepts standard 3-inch DWV pipe. Its one-piece design eliminates the need for bulky reducing couplings and provides a space-saving solution for vertical stacks, horizontal runs, and branch line transitions.

Ideal for gravity-fed, non-pressurized DWV systems, this reducing bushing is resistant to corrosion, chemicals, and microbial growth—making it suitable for both above-ground and underground installations (when approved by local code). The smooth interior finish promotes better flow, reduces buildup, and supports long-term system reliability.

Key Features:

• Size: 4 in. Spigot x 3 in. Slip (Hub)

• Material: High-quality white PVC (Polyvinyl Chloride)

• Standards Compliance: Meets ASTM D2665 and NSF requirements for DWV systems

• Connection Type:

  • Spigot End (4 in.): Fits into a 4-inch DWV hub or fitting

  • Slip End (3 in. Hub): Accepts 3-inch DWV pipe

• Application: Designed for non-pressurized drainage, waste, and vent piping

• Durable Construction: Resists corrosion, rust, and most household chemicals

• Installation: Solvent-weld both ends using PVC primer and cement for a watertight seal

• Compact Design: Saves space and fits easily into tight configurations

Typical Applications:

• Reducing a 4-inch drain line to a 3-inch pipe

• Use in bathroom or kitchen drain stacks

• Vent pipe size transitions

• Sewer line conversions in new installations or retrofits

• Residential and commercial DWV systems

Why Choose 247Garden?

247Garden provides premium-grade DWV fittings that meet strict industry standards for quality and reliability. Our 4 x 3 in. Schedule-40 DWV Reducing Bushing is trusted by professionals and DIYers for its precision sizing, ease of use, and long-term durability. Whether you’re tackling a new construction project or upgrading an existing plumbing system, 247Garden fittings are built to perform.

Note:
For use in non-pressurized DWV systems only. Not intended for potable water or pressurized lines. Always consult local plumbing codes before installation. PVC primer and solvent cement sold separately.