Intended for indoor use where external venting is impractical. Fits directly on to dryers with a rear spigot-type outlet, this kit is a uniquely designed water bath trap where the fine lint that is missed by the dryer filter is collected on the water surface. Simply fill to a 50mm depth of water and change when dirty. Suitable for dryers with a 100mm outlet flange or combine with DVS3 or DV4A diverter kits for dryers with flush outlet hole. Ideal for use where outside venting is impossible. Quick, easy installation! For use with electric dryers only!