... ,Relay valve,Protection Valve,Hand Brake Valve,Foot Brake Vave, Air dryer,Slack Adjuster and so on for trucks Product Name: Four -Circuit Protection ValveParts ... efficient and satisfactory service.4, Produce acoording to specification5, Detail Protection: (A) PORTS: Port1 M22X1.5, Port 21,22,23 ... me. I will give you my best service. brake valve Four-Circuit Protection Valve 934 702 250 0 934 702 260 0