The fire hydrants when not in use can be covered with hydrant caps. Plastic is used for constructing these caps, which can withstand weather conditions. These also protect the hydrants from vandalism, accidental impact, dust, and dirt. By keeping the hydrants protected from external factors, people can ensure optimal working during an emergency. These caps come in two colors, green and red, both with significance. Red hydrant caps mean the fire hydrants require repair and green hydrant caps mean they are in good working condition.