.This brand-new 4-circuit protection valve fits VOLVO European trucks with multiple OEM part numbers. As a key part of the air brake system, it stabilizes air pressure and safeguards four separate brake circuits for driving safety. Adopting high-precision internal components and premium alloy housing, it features stable pressure regulation, air tightness and long service life. Made fully according to OEM standards, it is an ideal aftermarket replacement for faulty or ageing valves.