Hartwig Aircraft Fuel Cell Repair started in 1952 as a one man operation doing all phases of aircraft repair. Ranging from changing tires, metal and fabric work, complete engine overhauls and the repair and restoration of fuel cells. The fuel cell repair and restoration portion of the business grew until Hartwig Aircraft Fuel Cell Repair stopped doing complete aircraft repairs and overhauls, and specializing solely in the repairing and restoration of aircraft fuel cells. Hartwig Aircraft Fuel Cell Repair's continued growth and success have been primarily due to our HIGH QUALITY Service and our COMMITTMENT to EXCELLENCE. Hartwig Aircraft Fuel Cell Repair is stilled owned and operated by the original family that started it in 1952. We also offers Monarch Premium Caps.