This listing is for a tube nuts designed to fit Cummins diesel engines with ISZ QSZ models. These nuts are compatible with various unit types and manufacturers, including those located in China. The part number for these nuts is 4935801, and they come in a unit quantity of two. Perfect for those in need of commercial truck parts, these tube nuts are a reliable and essential choice for maintaining the integrity of your engine's fuel system. Bid with confidence and ensure your engine runs smoothly with these high-quality tube nuts.