I use this rubber stopper in combination with a glass lid. It's not a perfect seal, but it sits well in the Chemex throat. The rubber stopper itself keeps my coffee a little warmer, but not for long. In combination with a lighter/tea cosy, my coffee stays hot/warm for hours. I probably don't need a glass lid, but I like the look and use it to hold the rubber stopper in place when pouring. Yes, you need both hands to pour anyway.
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