This fuel tester allows you to put preflight fuel samples back into your airplane (a great alternative to tossing sampled fuel onto the ground: a practice now discouraged by the EPA). Sample and check your fuel as always. Then, as sampled fuel is returned to the tank, a unique, built-in screen separates solids and non-petroleum contaminants, so only clean, pure fuel is returned to the tank. Reversible sump actuator fits both pin and petcock actuators. Wide mouth collector helps protect hands and clothing. Resilient plastic construction makes the GATS Jar virtually indestructible with normal handling.