Diesel common rail systems operate at very high pressures. Senior's fuel lines, in addition to its common rail solutions, ensure the efficient transfer of fuel between a high-pressure diesel pump/common rail and the diesel injectors.

Numerous high-strength steel grades are available for maximum durability along with a large variety of tube diameters and wall thicknesses to meet any designers' needs. Equal length tubes are designed for optimum tuning. Autofrettage process is also available for high pressure pulsation fatigue resistance.