... Brake Vave, Air dryer,Slack Adjuster and so on for trucks Product Name: Four -Circuit Protection ValveParts NO.: ... a manufacture, we specialize in air brake valves for many years.2, For variety of heavy vehicles and trucks( Dongfeng, ... VOLVO, BENZ, SCANIA, DAF, MAN and so on)3, ... Air Brake Valve Four -Circuit Protection Valve AE4170 for DAF