Comet Diaphragm Pumps Trolley Mounted Petrol Engine Driven Pumps. Comet BP125K 3 diaphragm pump. Honda GX340 with oil alert. Adjustable pressure regulator. Heavy-duty trolley - 13" wheels. Integrated pressure accumulator. On/off ball valve outlet control. 25 Bar safety valve. NBR diaphragms. 3m suction hose & filter.