Air pneumatic; case material is die cast aluminum; enclosure type is die cast zinc; depth 3 1/16 in.; o/a width 4 3/4 in.; o/a height 7 7/8 in.; special features include pneumatic controller for transmission systems hvac. The receiver controller is designed for use in pneumatic transmission systems to control dampers, valves; other devices include cover, pressure element 0 to 30 psig gage and graduated dial
