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The TIGRE USA INC 36-1076 is a sewer and drain reducing coupling designed to connect a 4-inch pipe to a 3-inch pipe in gravity-drain waste systems. This fitting allows licensed plumbers and drain contractors to transition between pipe sizes within the same drain line without cutting in an additional fitting or adapter. It ships in a package quantity of 10 units, making it practical for multi-fixture rough-in work or service van stock. The 36-1076 is a standard-duty coupling suited for below-grade and above-grade sewer and drain applications.
This reducing coupling is used in residential and light commercial plumbing systems where sewer and drain lines step down from a 4-inch main to a 3-inch branch or fixture outlet. Typical install scenarios include connecting a 4-inch building drain to a 3-inch closet bend, transitioning between stack and branch lines, or adapting existing drain runs during remodel work. Licensed plumbers working under IPC or local adopted code install this fitting as part of the DWV rough-in assembly.
Designed as an OEM-style replacement and new-installation fitting for 4-inch to 3-inch sewer and drain pipe assemblies in standard DWV systems.
Installation is performed by a licensed plumber in accordance with the applicable adopted plumbing code, such as the IPC or local equivalent. Shut off any upstream flow and verify the line is clear before cutting into an existing drain run. Solvent-weld or mechanical connection methods should follow the pipe and fitting manufacturer instructions and applicable code requirements. Do not use this fitting on pressurized supply lines.
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