This heavy-duty radiator cap is specifically designed for ISUZU NPR NQR models with 4HE1 4.8L, 4HK1 5.2L, and 6HE1 7.1L engines from 1998-2024. Engineered to maintain optimal cooling system pressure at 15 PSI, this cap features a robust metal construction with a secure sealing mechanism. The cap includes bilingual safety warnings and clear operating instructions. Its distinctive design incorporates radiator connection for proper coolant level maintenance. The rubber seal ensures a tight fit, while the ergonomic grip allows for easy handling during maintenance. Remember to follow the important safety precaution of never opening the cap when the engine is hot, and always check coolant levels through the reserve tank. This replacement part matches the original specifications for reliable performance and proper cooling system function.