Koshin PGH 50 Pumps Trolley Mounted Diesel Engine Driven Pumps. Koshin PGH 50 Thermoplastic Pumps Hatz Diesel Engine. 2" Diesel Engine Pump using the Koshin PGH-50 2" PVC pump head and the Hatz 1B20 Diesel Engine. Ideal pump for industrial, Marine and agricultural uses. Salt water, fuel Oil and mild chemical resistant.