Haldex Midland Foot Operated Valve KN22150 Two separated, individual service brake circuits in a single housing. Each circuit individually controls front and rear service brakes. Meets FMVSS-121 requirements - 1975 and up. Supply Ports (4) 3/8" NPT, Delivery Ports (4) 3/8" NPT, Mounting Studs 5/16"-24 Thread 5/8" Length Volvo 3093687