Parker Hannifin Corp, Tube Fittings Div About Parker Hannifin’s Tube Fittings Division Since 1924, Parker has served the marketplace with dependable fluid power technology. Much of that expertise originates with precision-made tube fittings, which were among the first products produced by Parker. Today, some of TFD latest innovations include; Trap Seal™ O-ring, Robust Port Stud™, SAE aluminum fittings, XTR coating and Complete Piping Solutions™. TFD manufactures a broad line of standard and specialty flu...