Instrument and method for inserting a shuttle into a circuit and installation for spraying coating product comprising such an instrument

An instrument for inserting a shuttle having an axial magnetic polarization into a circuit for circulating a coating product, the instrument comprising:

• a receiving chamber for receiving the shuttle, the chamber being formed in a body of non-magnetic material and sized for receiving the shuttle in a position where an axis of polarization of the shuttle is parallel to a longitudinal axis of the receiving chamber;
• a mouth connecting said receiving chamber to a first end of the body of the instrument;
• a control lever, equipped with at least two magnets and movable with respect to said receiving chamber, between a first position, where a first magnet is aligned with the longitudinal axis of said receiving chamber, with a pole oriented towards said receiving chamber having a first polarity, and a second position, where the second magnet is aligned with the longitudinal axis of said receiving chamber, with a pole oriented towards said receiving chamber having a second polarity, which is the opposite of the first polarity.