The product is a set of NOS (New Old Stock) GM Heater Control Valves with the manufacturer part number 15688297. These valves are specifically designed for use in GM vehicles made between 1990-1995 and are made in Canada by the original manufacturer. The valves control the temperature and flow of heat in the vehicle's heating system, ensuring that the system operates efficiently and effectively. Perfect for anyone looking to replace or upgrade their heater control valves in their GM vehicle from this specific time period.