A stack of very thin metal plates provides high surface area for catalytic decomposition of a fluid flowing axially from upstream to downstream through the stack. The oil passage-switching valve has a main pressure-adjusting chamber for the main oil pump, a subsidiary pressure-adjusting chamber of for the subsidiary oil pump, and a spool valve that performs partitioning between the main pressure-adjusting chamber and the subsidiary pressure-adjusting chamber. The device comprises a first part made up of a label attached in a way to block the security module on the printed circuit board, said label including at least one chip and a first antenna. A valve 28 is provided at the bottom of the back plate 12 so that a cylinder of breathable gas connected to the valve may be retained by a retaining strap 13. Additionally, the cover moves from a bin covering position into a cab shielding position.