The McAlpine DWU60-CB is a type of basin waste fitting made from chrome-plated brass. It has a 1¼" diameter and is unslotted, which means that it is designed to allow water to flow freely without being restricted. The backnut model of the DWU60-CB has a 60mm flange and a 3½" tail, which refers to the length of the threaded pipe that attaches to the basin. The mushroom cover plate is the decorative component that covers the waste hole in the basin and is typically circular in shape with a domed top that resembles a mushroom. Overall, the McAlpine DWU60-CB is a high-quality, durable basin waste fitting that is designed to provide reliable and long-lasting performance. It is a popular choice for both domestic and commercial plumbing applications, and its chrome-plated brass construction ensures that it is resistant to corrosion and easy to clean. ・ Unslotted ・ 1¼" BSP ・ Suits basins without overflows ・ Mushroom cover plate is always open allowing the water to flow freely through the basin ・ 60mm flange