This seemingly simple enclosed sampler, primarily composed of the housing, sampling bottle, quick connector (sampling needle), pipeline, pressure gauge, valves, seals, and flanges, plays a crucial role, especially in the non-leakage sampling of hazardous, flammable, and explosive medium-pressure gas and liquid media. It is instrumental in obtaining samples with strong authenticity, high accuracy, and no residual liquid or gas emissions, effectively preventing harm to the operators from toxic and harmful substances and avoiding pollution of the surrounding environment, as well as potential hazards during sampling. It's not just about obtaining a sample; it also ensures a long service life and simple operation.