The T&S 010391-45 Overflow Coupling Nut is a critical component for commercial kitchen waste drain systems, designed to seal two male threads securely while preventing odors and blockages. Its chrome-plated construction ensures durability in high-traffic restaurant environments, making it a reliable choice for professional chefs and facility managers. This 1 5/8-12 UN female-threaded nut measures 1 23/32 in. outer diameter and 1/2 in. in height, providing a robust fit for standard sink drain assemblies. Whether you're installing a new waste drain or replacing a worn part, this coupling nut delivers long-lasting performance with minimal maintenance. Backed by a 1-year limited warranty, it’s an essential part for maintaining clean, functional, and hygienic commercial sinks.