The T&S Brass B-3972-01-XS is a high-quality waste drain valve designed for efficient drainage in sinks with a 3-1/2" sink hole. It features a short lever handle for easy operation and includes an overflow tube to prevent water overflow. The valve is equipped with a 1-1/2" NPT female outlet and a 2" NPT male outlet, ensuring compatibility with various plumbing systems. This durable and reliable drain valve is ideal for both commercial and residential applications, providing a seamless solution for waste management.