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The Studor Vent will work as the existing stack will stay in place. The AAV vent only opens when a vacuum happens but the drain line must also have a live vent to allow air to “push” ahead of the water. The toilet will not flush properly without a live vent.
How far is the new toilet from the old? If the drain line is 3”, you can go within 6’ and be within code...if a 4” drains line is installed, you are good up to 10’. Btw, the AAV valve mus not be buried in a wall and must be accessible for service and repair.
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1986 3.2 Carrera
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