3 inch x 4 inch PVC DWV Reducing Soil Adapter Soil x Plastic

4 inch x 3 inch PVC Soil Adapter – DWV Transition Fitting, Solvent Weld x Spigot

The 4 inch x 3 inch PVC Soil Adapter is a solvent-weld transition fitting used in non-pressurized sanitary drainage systems. Designed for drain, waste, and vent (DWV) applications, this fitting enables the connection between a 4 inch hub or fitting and a 3 inch pipe. It is commonly used to adapt vertical or horizontal stacks to fixtures or other DWV branches during new construction and retrofit installations.

Manufactured from rigid polyvinyl chloride (PVC) and produced to meet ASTM D2665 and D3311 specifications, this fitting provides dimensional consistency, chemical resistance, and long service life in gravity flow systems. It is suitable for above-ground and underground use in accordance with local plumbing codes.

Technical Specifications

• Size: 4 inch hub x 3 inch spigot (nominal)
• Material: Schedule 40 PVC
• Connection Type: Hub x Spigot (solvent weld)
• Standard Compliance: ASTM D2665, ASTM D3311, CSA B181.2
• Use Type: Non-pressure DWV systems
• Temperature Rating: Up to 140°F continuous service

Application Areas

This DWV adapter is typically used in:

• • Transitioning between vertical stacks and branch piping
• • Adapting soil pipe to PVC in residential or commercial plumbing
• • Fixture rough-ins requiring offset or stepped diameter connections
• • New installations and code-compliant retrofits

Installation Guidelines

Deburr and clean both the spigot and hub surfaces before applying solvent cement and primer in accordance with ASTM D2855 joining procedures. Ensure full insertion into socket and allow curing per manufacturer recommendations before testing. Verify alignment and slope according to UPC/IPC guidelines for gravity drainage systems.

Material Performance Note

PVC DWV fittings are resistant to corrosion, biological degradation, and a wide range of household and industrial chemicals. Their light weight and ease of solvent welding make them a preferred choice for long-term, code-compliant drainage installations in both residential and commercial settings.