The McAlpine WU1A 1¼" Urinal Waste is a plumbing fitting used to connect a urinal to the waste pipe. It has a 60mm flush flange that fits into the urinal outlet and a 3½" tail with a backnut that connects to the waste pipe. Here is a breakdown of the components: 1¼" refers to the diameter of the waste outlet that fits into the urinal. 60mm flush flange is the part that sits inside the urinal outlet and creates a seal to prevent leaks. 3½" tail is the part that extends from the flush flange and connects to the waste pipe. Backnut is the threaded cap that secures the tail to the waste pipe. Overall, the McAlpine WU1A is designed to provide a secure and leak-free connection between a urinal and the waste pipe. ・ Available with Chrome Plated Plastic or white plastic tail ・ 1¼" BSP ・ 60mm Flush Flange ・ 3½" Tail ・ Manufactured in Polypropylene