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The MUELLER STREAMLINE ABSCOMBY3112 is an ABS DWV long radius combination tee wye fitting used in drain, waste, and vent piping systems. It connects a 3-inch main line to a 3-inch run with a 1-1/2-inch branch outlet, all in a hub x hub x hub configuration. The long radius sweep reduces flow resistance and helps maintain drain velocity, which is critical in properly functioning DWV systems. Licensed plumbers install this fitting during rough-in on residential and light commercial drain lines where a combination of tee and wye geometry is required to meet code slope and flow requirements.
This fitting is suited for residential and light commercial DWV applications including horizontal drain runs, branch connections from sinks, lavatories, and other 1-1/2-inch fixtures tying into a 3-inch main. The hub connections accept standard ABS pipe with solvent cement, making for a straightforward, solvent-weld installation. It is appropriate wherever IPC or local plumbing code requires a combination fitting in lieu of a standard sanitary tee on horizontal-to-horizontal connections.
Designed as an OEM-style replacement or new-installation fitting for residential and light commercial ABS DWV piping systems using 3-inch and 1-1/2-inch schedule 40 ABS pipe.
Installation should be performed by a licensed plumber in accordance with the International Plumbing Code or applicable local plumbing code. Turn off the water supply and ensure the drain system is depressurized and clear before cutting into existing lines. Solvent-cement all hub connections using ABS-rated cement, following manufacturer cure times before restoring flow. Verify branch slope meets minimum code-required grade, typically 1/4 inch per foot for the 1-1/2-inch branch run.
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