Recommended for the technician who already has cooling system adapters. Seals to cooling system using widely available positive fit cooling system adapters. Recommended for large trucks with big diameter cooling system filler necks requiring cooling system adapters. Use shop air (80+ psi) to create a vacuum and refill a drained cooling system in less than five minutes. Hands free on/off air valve allows preparation of coolant solution while vacuum is created. Eliminates “airlocks”, filling the cooling system completely the first time. No hose swapping. Gauges equipped with internal shock dampener. Packaged in a durable molded plastic carrying case.