Typically used on auxiliary axle applications or to rapidly exhaust air suspensions, activated by applying pilot pressure. •A robust remote mounted valve suited for any chassis location •This durable valve is typically used on auxiliary axle applications or to rapidly exhaust air suspensions •Activated by applying pilot pressure •When connected to the gladhand or parking brake line, this valve automatically exhausts the air suspension (4) 1/4" NPT ports, (1) 1/8" NPT port.