Ever wonder if your drip system is running or not? Do you hate having to walk out to the system and look closely at it to see if there is in fact water flowing through it? Good news! With a pop-up indicator you will never have to wonder ever again! These indicators are designed to pop-up when the water pressure is applied to the system, raising the mast of the indicator up above the shrubbery and plant life. When the red mast top is visible you know that the system is up and running.