Magic Trap fitting is a 1 1/2-Inch tubular polypropylene fitting. The Magic Trap fitting replaces any standard 1 1/2-Inch tubular trap. The Micro size Magic Vent AAV screws directly onto the tee connection of the Magic Trap fitting. It automatically places the Magic Vent at the required 4-Inch height above the drain pipe to which it is connected. The installation time for the vent system is approximately 25 seconds. SAVES TIME AND MONEY.