... )* 3A110, 3A120(N. O. ), 3A120(N. C. ), series air operated valve. * Exterior control, 3 port 2 position. * Port size: M5χ 0 ... ".* 3A210, 3A220(N. O. ), 3A220(N. C. ), series air operated valve. * Exterior control, 3 port 2 position. * Port size: 1/8", 1 ... (N. C. ), series air operated valve. * Exterior control, 3 port 2 position. * Port size: 1/4", 3/8". 3 Port Air Operated Valve (3A100, 200 ...