The BG Products Coolant Transfusion System, No. CT2, quickly and efficiently installs new 50/50 coolant while simultaneously removing worn out coolant. According to the company, this method is more convenient than conventional drain-and-fill methods, which can be time-consuming and messy. This unit helps prevent the intermixing of new and used coolant and sends fluid through places in the cooling system not accessible when fluid is flowing in the regular direction. Flushing coolant is important because as it flows through the engine, it gradually loses its additives and thus becomes corrosive and unable to effectively dissipate heat from the engine or insulate it from the cold.