OE-spec solenoid valve unit controls air distribution precisely. Arnott's air suspension solenoid valve block is a direct replacement for the vehicle's failing valve block. The Arnott solenoid valve block is made from the highest quality materials including O-rings and electrical components and is designed to meet or exceed the original equipment. An air suspension solenoid valve block is responsible for distributing air from the compressor to your air struts or air springs. Over time valve block O-rings can dry rot and leak air causing your compressor to overwork or allow moisture to degrade the electrical solenoid components causing additional problems.