RS-2 Rising Stem Valve Operator Pneumatic RS-2 Rising Stem pneumatic powered valve operator. Complete with LCD revolution counter, torque arm extension bar, manual and steel storage case. Operates standard 1in (25.4mm) non rising valves with optional drive adaptor hub 09-402-00. Operates valves from 6 to 60in (15.2 to 152.4 cm), open 4in hub design accomodates most rising stems, maximum torque of 800 ft/lbs (1085 Nm). Feautres forward and reverse operation with variable speed control.