Mueller Industries 5981 Pvc Dwv Increaser Reducer 6x4 in

Product Description

The MUELLER INDUSTRIES 5981 is a 6-inch by 4-inch PVC increaser/reducer fitting with hub-by-hub connections, designed for use in non-pressurized drain, waste, and vent (DWV) sanitary systems. Manufactured to ASTM D2665, F1498, D331, and D1784 standards and certified to NSF 14, this fitting delivers smooth, consistent interior walls that promote full flow and resist scaling and corrosion. It is installed by licensed plumbers in residential and light commercial drainage systems where a transition between 6-inch and 4-inch hub-end pipe is required.

This fitting is suited for non-pressurized DWV applications in sanitary drain, waste, and vent piping systems. The hub-by-hub configuration accepts solvent-welded PVC pipe on both ends. Typical installation scenarios include main drain stack reductions, building drain transitions, and branch connections where pipe diameter changes are necessary. The fitting is appropriate for use in residential new construction, renovation work, and commercial plumbing projects governed by applicable plumbing codes.

Key Features

• 6-inch by 4-inch increaser/reducer with hub-by-hub solvent-weld connections
• Smooth interior walls promote full flow and reduce scaling buildup
• Superior resistance to chemicals and corrosion inherent to PVC material
• Manufactured to ASTM D2665, F1498, D331, and D1784 specifications
• NSF 14 certified for drain, waste, and vent applications
• Uniform interior and exterior dimensions for consistent, reliable fitment

Compatibility

Designed as an OEM-style DWV replacement or new-installation fitting for non-pressurized PVC sanitary drain, waste, and vent piping systems using hub-end connections.

Installation Notes

Installation is performed by a licensed plumber in accordance with the applicable International Plumbing Code (IPC) or local authority having jurisdiction. Solvent-cement both hub ends per ASTM D2564 procedures, ensuring pipe ends are cut square, deburred, and cleaned before applying primer and cement. Do not use this fitting in pressurized water supply lines. Allow full cure time before pressurizing or flowing waste through the system.

Technical Specifications

• Inlet Size: 6 inches
• Outlet Size: 4 inches
• Connection Type: Hub x Hub (solvent weld)
• Material: PVC
• Application: Non-pressurized DWV sanitary systems
• Standards: ASTM D2665, ASTM F1498, ASTM D331, ASTM D1784
• Certification: NSF 14

Standard Information

• Brand: MUELLER INDUSTRIES
• Manufacturer Part Number: 5981