The indicator is made with a top and bottom layer separated by 3 supporting ribs. Once the unit is fired, the top layer falls into the bottom layer leaving the 3 ribs still standing, indicating the unit has been fired or tampered with.
Installation is very easy, first you assemble the indicator onto the crown of the valve where it seats securely, then install your accessory as normal. Great selling point and feature to have.
This indicator functions on a 20mm Majesty Valve, and standard 1” valves.
A must have accessory for the GTM-600, the GTM-1000, the Flip Top 1000 and 2000 series.