The United Model 5400 Vertical Post Indicator is UL Listed / FM Approved. It is used to identify the position of buried Gate Valves (Post Indicator Valves) and is recommended for use in fire protection piping systems. It consists of four components, the Post, Telescoping Pipe, Base, and Stem. The Model 5400 is universal. It is adjustable to accommodate valve bury depths from 3 feet to 8 feet.