The Bühler sampling pump P1.1 utilizes a bellows (also known as a windbox or diaphragm) made from a single solid PTFE block through one-time molding. This special design effectively extends the pump's service life in various application environments. It is specifically engineered for demanding gas applications, such as when liquid flows through the pump due to failure of moisture-heating components in the system or a sudden increase in moisture, or when condensation needs to form at a certain point. Users can simply orient the pump head downward, allowing liquid to accumulate in a specially designed recess between the pump head and the bellows.