The product is a NOS (New Old Stock) 1966-68 Mercury Montclair Secondary Air Injection Pump Check Valve, manufactured by Delco. It is designed as a factory replacement part with the OE/OEM Part Number 12323876. The valve is designed for the passenger side of the vehicle, has a thread size of 3/4" x 14, and includes one piece of the valve. This secondary air injection pump check valve is a crucial component in the emission control system of the vehicle, ensuring proper functioning of the air injection pump.