A gas washing bottle consists of a (usually) cylindrical bottle/flask with a female ground glass joint, where a specialized male ground glass joint stopper with two glass tubes can be attached. The stopper has two external glass tubes, one enters the stopper from one side, taking a 90° angle and extends until near the bottom of the flask, while the other is connected directly to the stopper. Some special types of gas washing bottles have a fritted glass.
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