Models View all Max-Air MA-63252 1/4" NPT Air Filter Regulator 15 305 1 1/4" actuated ball valve 20 571 2 1in NPT Ball Valve 3pc SS 24 668 1 Valve Gear Operator GO-01-ISO 21 900 2 3/4" NPT Actuated Ball Valve 40 1805 10 Electric Actuator Max-Air AE01-AE02 11 433 2