The sewer core is made of strong ABS material, which has a good texture and can last for a long time. The built-in reverse valve of the floor drain fitting can prevent the backflow of sewage, avoid the growth of peculiar smell, a good floor drain part. Features - Color: Black -Material:ABS - Size: 5.00X5.00X3.50cm/1.97X1.97X1.38in -Hole diameter: 48mm - Easy to use, effortlessly lets liquid seamlessly drain for results, meet your different needs in daily life. - The fitting for floor drain is high-efficiency and suitable for use in bathrooms, laundry rooms and kitchens. - Floor drain core is made with fine workmanship, excellent texture, high efficiency and durability to help provide the best performance - Sewer core seal smell and odor from sewage gas, prevent the drain water from backing up to the room - Insert the floor drain core into the floor drain, installs easily, stable and durable, with a long serving time Package list: 16 x backflow preventer strainers