The McAlpine TWL-21 is a 1 1/2" X 21" standing waste fitting with a 3 1/2" tail, designed for use in a wide range of plumbing applications. The standing waste is a plumbing component that is used to provide drainage for a variety of fixtures, including sinks, basins, and bidets. The TWL-21 is designed with a 1 1/2" diameter and a 21" length, providing a suitable height for use with various types of fixtures. The 3 1/2" tail of the TWL-21 is designed for easy connection to a waste pipe, and is compatible with a wide range of plumbing systems. This makes installation and maintenance of the standing waste quick and easy. The McAlpine TWL-21 is manufactured by McAlpine, a leading manufacturer of plumbing and drainage systems, and is designed to meet the highest standards of quality and durability. It is suitable for use in a wide range of applications, including commercial and residential buildings. Overall, the McAlpine TWL-21 standing waste provides a reliable and effective solution for drainage needs, and is designed for easy installation and maintenance. The 3 1/2" tail ensures compatibility with a wide range of plumbing systems, making it a versatile choice for a variety of applications.