Cummins ISX/QSX 3201261 Fuel Tube Drain Line PAI 180273CROSS REFERENCE: 3201261 APPLICATION: Cummins ISX QSX Multiple Use Application BRAND: PAI 180273 Cummins 3201261 Fuel Tube Drain Line PAI 180273. OEM replacement parts and truck components. Maintains steady fuel return pressure and supports long term injector reliability. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts industry.