The GATS Jar Fuel Tester the only fuel analysis tester capable of separating non-petroleum contaminants and thereby purifying water and debris from contaminated AVGAS and jet fuel. This allows extracted fuel to be put back into the aircraft fuel tank and not on the ground, without the fear of reintroducing contaminants back into the fuel system. It also gives a visual display of jet fuel contaminated AVGAS and can be used with any petroleum fuel grade and octane, including Jet A fuel, automotive gasoline and diesel fuel. The GATS jar comes packaged in a reusable plastic bag. Save this bag to put the tester into after each use, when it is stored in the cabin during flight.