ABS Side Outlet Plastic Drain combines roof drain and flashing skirt. Incorporates 90 degree right angle outlet for shallow joist areas. Includes nylon dome grate with screw kit, one expansion coupling and deck screw kit. Dimensions: Drain / Flange: 15-3/4" x 15-3/4". Drain Basin: 9-1/4" x 9-1/4".