These high-quality engine coolant thermostats are specifically designed for Isuzu NPR, NPR-HD, NQR, and NRR models from 1998-2016 with 4HE1 4.8L and 4HK1 5.2L engines. Featuring precise temperature regulation at 85°C and 82°C, those thermostats help to maintain optimal engine operating conditions for enhanced performance and longevity. The units come complete with a rubber gaskets for proper sealing and is manufactured to meet OEM specifications. Ensures excellent fit and function, while the durable construction provides reliable operation in demanding conditions. It is a direct replacement part that helps maintain proper engine temperature control. Backed by a 6-month manufacturer warranty, those thermostats are an essential component for maintaining your Isuzu commercial vehicle's cooling system integrity.