The DeWalt N108974 Front Housing Dust Port is a genuine replacement component designed to collect and divert dust and debris away from the blade during cutting. This is Part 1 of a two-part dust port assembly and must be used with Part 2, DeWalt N168420. Four pieces are required in total: 1 × N108974, 1 × N168420 and 2 × 370748 screws.