NOS. This is a brand new, OEM 6V-3866 water valve designed for Caterpillar equipment. It is compatible with Caterpillar equipment make and is a reliable replacement part for heavy equipment. The valve is manufactured by CAT and is of the highest quality. This valve will ensure proper water flow in your equipment without any leaks or malfunctions. It is suitable for use in various Caterpillar models, including the CATERPILLAR 6V-3866 model.