have to say really good product. Use it to test fuel, shit or dirt in the can and is blocked by a mesh screen from entering the tank during back pressure. Simply slip the flexible fuel tank drain hose into the round neck and squeeze the drain valve and it goes straight into the can in front of the screen section. You can clearly see what exactly was in your tank. It's big enough to get a really good sample and see the water very clearly, some of the smaller screwdrivers you couldn't even milk a mosquito in, it's a big can in a small bag. With the R44 I get good traction with both tanks. I fly with free space and (so far) can clearly see any problems and then just fill up the tank. The only improvement I think they could make is a lid that covers the device when you're done to prevent dirt or dust from getting in from where you store the device. I saw this on a car I flew in and it initially motivated me to buy one of these. I actually bought two of these because they are so good
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