Abstract: A T-connector holding tool is a tool for immobilizing or applying a torque to a T-connector. The tool has an elongated handle portion and a head portion fixed to the handle portion. The head portion includes a pair of rigid claws, each including an interior surface sized to capture a corresponding one of two aligned nuts of the T-connector. When applying a torque to the third nut of a T-connector, the T-connector is immobilized by capturing the aligned first and second nuts and applying a counteracting torque to the T-connector, the counteracting torque being opposite the torque applied to the third nut.