Ferrari Part 3.3525.0300.3 Signal Valve Pressure Difference in Ferrari 365 GTC4 (Mechanical) (Mechanical Table 030 Brake Discs, Brake Lines)

Ferrari part number 3.3525.0300.3, SIGNAL VALVE PRESSURE DIFFERENCE, shown here as used in a Ferrari 365 GTC4 (Mechanical) (Mechanical Table 030 Brake Discs, Brake Lines).