This Kenworth W900B Stainless Steel Upper Coolant Tube is designed to fit most Kenworth W900B models with Caterpillar 3406E, C15, and C16 engines. Made from durable 304 stainless steel, this tube is built to last and is sold individually. It is a direct replacement for OEM number K181-5609 and is also compatible with aftermarket parts. This product is a practical and reliable solution for those in need of a replacement coolant tube.