This radiator is a high-quality, bolt-on part for your Chevrolet W4500 Tiltmaster Isuzu NPR. It is made of durable aluminum and has been tested for performance. The radiator is designed for the engine compartment and is compatible with OE/OEM part numbers 8973333621, 8973331410, 8973331400, 8973331404, and 10412468010. Please note that this product can expose you to chemicals including lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. It is recommended that you consult with a professional for installation and maintenance. This radiator is not a universal fitment and is not intended for use as a performance part.