Eliminates the introduction of bubbles and air-locks into the cooling system and dramatically reduces system filling time. No more time-consuming system bleeding. Reduces fluid waste and messy spills. Automatically conducts system leak test. Two adaptors cover most radiators and header tanks, including those of commercial vehicles. Simple operation requires workshop air supply and does not require fiddly interchange of vacuum and fluid hoses - as found on other versions of this tool. Supplied with 1.5mtr of fluid hose.