Air admittance valves. See Document Files.
The Micro Size Magic Vent® AAV has a 1 1/2 inch female threaded connection, however the valve is rated for 1 1/4 inch to 2 inch individual or branch vent pipes. When used in combination with the Magic Trap™ fitting, it is the quickest way to install a venting system. Magic Vent Micro is also available with ABS or PVC adapter for easy installation in a wall cavity.
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