Complex sentence: Strictly the term refers to the pump itself, which is normally manually operated, though electrically powered and gas powered pumps are occasionally used; when manually powered, the term "handpump" is often used to refer to both the pump and the associated handle.
Split into simpler sentences: Strictly the term refers to the pump itself, which is normally manually operated, though electrically powered and gas powered pumps are occasionally used. When manually powered, the term "handpump" is often used to refer to both the pump and the associated handle.