Keep your ISUZU NPR, NPR-HD, NQR, or NRR running at optimal temperature with this pair of OEM high-quality thermostats. Designed specifically for 4HE1 4.8L and 4HK1 5.2L engines (1998-2024), these thermostats regulate coolant flow with precision at 82°C and 85°C operating temperatures. The vehicle-specific fit ensures proper installation and reliable performance for your commercial truck's cooling system. Installation is straightforward with no assembly required, and the product includes a 1-year manufacturer warranty for added peace of mind.