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A sanitary tee directs traffic in your home’s drain-waste-vent plumbing system to make sure wastes go down to the sewer and gases go out the vent stack.
Like other types of T fittings, it connects two pipes for a main run and one at 90 degrees for a branch run. A little different than a standard tee, it’s designed so waste will flow through it smoothly—the branch run curves toward the perpendicular main run (a similar tee with a long, sweeping curve is called a combination tee).