Hunter ECOID12 12" Yellow/Black Eco-Indicator is a robust device that will indicate when the system is currently in operation. Once the pressure exceeds the threshold, the riser will pop up displaying a bright yellow or reclaimed purple stem. This commercial grade body attaches to either polyethylene or PVC through a ½” NPT connection thus avoiding ¼” tubing. This adds durability to the system that no other indicator can boast. When the system is not active, the Eco-Indicator will be in its retracted state and be flush to the ground.