Radiator Vacuum & Fill Kit: The radiator vacuum refill kit quickly vacuum and fill coolant that helps avoid airlocks for better circulation. Works with an air compressor (not included) to save time and eliminate tedious bleeding steps Fit Most Vehicles: The vacuum coolant fill kit includes multiple adapters OD: 1.38/1.57/1.77/2.17 in (35 / 40 / 45 / 55 mm) plus a tapered universal adapter (fits 0.551.8 in), fitting most cars, SUVs, pickups, and light trucks, including BMW, Ford, Fiat, Volkswagen, Porsche, Mercedes-Benz, Nissan, Mercedes-Benz, and Nissan Leak-Proof Refill Tool Kit: Made of high-strength aluminum, the coolant vacuum refill kit ensures excellent sealing and pressure resistance. Features a shock-resistant precision gauge (-76 to 0 cmHg / -30 to 0 inHg; max vacuum -0