Upgrade your Isuzu truck's fuel system with this premium set of 4 sleeve nozzle holders, specifically designed for NRR, NQR, NPR-HD, and NPR models equipped with 4HK1 5.2L or 6HK1 7.8L engines from 2005-2010. Each precision-machined brass nozzle holder features durable construction with a sleek gold finish and comes with a red O-ring seal for reliable performance. The cylindrical design with beveled top ensures proper fitment and optimal fuel delivery. These replacement nozzle holders are manufactured to exact specifications to maintain proper fuel atomization and engine performance. The set includes all four nozzle holders needed for a complete system service. Professional installation recommended to ensure proper torque specifications and sealing.