Frost heaving can push heads out of the ground, leaving them susceptible to damage. Also, if the proper flexible swing joints are not installed under each head, they also can break if driven over or stepped on. Keep a supply of various sprinkler heads on hand for emergency replacements, and stock an assortment of mist heads, as they tend to clog easily and will need replacement most often. Older systems may be out of date and in disrepair, but a thorough inspection can determine whether it should be replaced or if it can be updated. Older systems can be set up with new controllers if the field wires are in good shape.
Many systems can accommodate different types of heads.
Additional heads, valves and lines can be added if needed. If galvanized pipe was installed, it may lose flexibility and can be replaced with flexible swing joints.