RS-2 operates valves from 6in to 60in (15.2 to 152.4 cm), open 4in hub design accomodates most rising stems.RS-2 Rising Stem 1in (25.4mm) square drive adaptor hub fits into 4in (101.6mm) open head to adapt the RS-2 to operate standard 1in (25.4mm) AWWA square drive, non-rising stem valves.