Dryer Vent Test Kit ensures your dryer's vent system is operating properly. Kit includes two tests depending on the location of your dryer's lint screen: One for the lint screen in the top of your dryer, and one for the lint screen in the front of your dryer. Instructions included.Part Number W11224254 (AP6333505) replaces 8522199, W10106710, WPW10106710, 3978548, 4392908, 4814253, 50738, PS12349511.