TAC Series (Total Air Control) Push Button Valves by Humphrey Products are recognized for long life, small size, rugged construction and attractive appearance. The manual / mechanical air valves are popular choices by design automation engineers. The small stainless steel push button or plated-steel toggle are popular for panel mounting solutions to start, sequence or control equipment with the same outward appearance as traditional electric-style machine controls. The wide variety of valves is available as 2-, 3- and 4-way, in three sizes, and either spring return or detent function.