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The MUELLER STREAMLINE K009800 is a DWV reducing coupling designed to connect drain, waste, and vent piping where a 3-inch line transitions down to a 2-inch line. Manufactured from PVC, this hub-end fitting accepts standard DWV pipe on both ends and maintains proper flow direction through the reduction. The nominal sizing of 3 x 2 inches makes it a common fitting in residential and light commercial drain systems. Licensed plumbers and pipe fitters install this coupling during new construction and renovation work where pipe size changes are required within the DWV stack or branch lines.
This reducing coupling is suited for drain, waste, and vent applications in residential and light commercial plumbing systems. It is used at transition points in horizontal drain runs, vertical stacks, and branch connections where the pipe diameter steps down from 3 inches to 2 inches. The hub end style accepts pipe inserted directly into the socket for solvent-cement joining, which is standard practice in PVC DWV installations built to IPC and UPC requirements.
Designed as an OEM-style replacement and standard fitting for PVC DWV piping systems requiring a 3-inch to 2-inch reducing hub connection.
Installation should be performed by a licensed plumber in accordance with the applicable plumbing code, such as the IPC or UPC. Before cutting into an existing drain line, isolate and drain the affected section of piping. Clean and dry all pipe ends and hub sockets before applying PVC primer and solvent cement, following the cement manufacturer's cure time before returning the line to service. Do not use this fitting for pressure piping or supply-side applications.
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