American Standard 6400-0361-01 M33901 USNT Valve

American Standard's 6400-0361-01 M33901 USNT Valve is a replacement valve assembly from the American Standard line, identified by part numbers 6400-0361-01 and 6400036101 alongside the M33901 USNT designation. This valve is designed to integrate with American Standard toilet fixture packages as a service part to restore or maintain the flush valve function, providing controlled flow within the toilet's valve train. The unit is compact and engineered for compatibility with American Standard components; typical applications include service and repair of older American Standard flush valve assemblies where an OEM replacement is required. The 6400-0361-01 / 6400036101 designation helps technicians locate the exact OEM part and ensures correct fitment with matching interfaces and overall valve geometry, supporting reliable operation of the flush cycle. For buyers seeking to maintain original performance and preserve fixture warranties, using the manufacturer-recommended replacement part is advised, and this valve's codes (M33901 USNT) reflect its place in American Standard's repair-part catalog.