Combination clothes dryer heat saver and lint trap. Provides extra heat and humidity from clothes dryer into room. Damper handle to vent air inside or outside. Removable and reusable easy-to-clean lint filter. For use with 4" flexible duct or metal pipe. Includes 2 stretch clamps. Recommended for electric dryers only. Color: White. From the Manufacturer ProFlex heat keeper kit. Directs warm, moist air from electric clothes dryers into your home. Safety valve eliminates dryer back pressure. Includes heat keeper unit, removable lint cap, 2 plastic clamps.