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The MUELLER STREAMLINE 5908 is a PVC flush bushing fitting designed for drain, waste, and vent (DWV) piping systems. It transitions a 3-inch spigot connection down to a 2-inch hub, allowing plumbers to reduce pipe size within a DWV assembly without adding unnecessary stack height. The fitting is manufactured from PVC conforming to ASTM D1784 and meets NSF 14 and UPC standards. Smooth interior walls reduce turbulence and resist scaling, while the flush profile keeps the fitting compact within the pipe run. Licensed plumbers install this type of bushing during new construction and retrofit drain line work.
The 5908 is suited for residential and light commercial DWV applications where a flush-style reducing bushing is required. Its chemical and corrosion resistance also makes it appropriate in environments where drain lines may carry mild chemical waste. The spigot-by-hub end configuration allows it to insert directly into a hub fitting while accepting a 2-inch spigot on the outlet side. Dimensional consistency ensures tight, reliable solvent-welded joints throughout the assembly.
Designed as an OEM-style replacement and standard-fit component for 3-inch to 2-inch PVC DWV piping assemblies conforming to ASTM D2665 and F1498 dimensional standards.
Installation is performed by a licensed plumber in accordance with the International Plumbing Code (IPC) and applicable local amendments. Shut off water supply and ensure the drain line is clear before beginning work. Solvent-cement the spigot end into the receiving hub using PVC primer and cement rated for DWV applications, following the cement manufacturer's pot life and cure time requirements. Do not apply heat to seat the fitting.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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