The T&S Brass B-3960-01-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 male adapter for secure connections and a 2" NPT male outlet for optimal drainage performance. This durable and reliable drain valve is ideal for both commercial and residential applications, ensuring smooth functionality and longevity.