I currently use a Spiedel 60L plastic fermenter and am trying to figure out the best way to draw a sample without introducing O2. It's basically a lightweight plastic bucket with a secure lid with a hole for the airlock and a spigot. I have drawn samples from the spigot but that always draws air in through the airlock. I have taken samples by removing the lid but I know this also lets in a lot of air. I have thought about getting a wine thief to use in the airlock hole but the liquid is usually 11"=12" below the level of the lid and it seems to me like opening that would also allow air to get in. How do you guys get samples to test gravity, flavor, aroma, etc without exposing your beer to O2?