The 3 Hunter Ultra Rotor Head Adjustment Wrench Tool Key is a specialized irrigation sprinkler adjustment tool designed for use with Hunter sprinkler systems. Made of durable plastic and metal materials, this white key wrench adjuster is perfect for maintaining and adjusting sprinkler heads in your yard or garden. Specifically designed for the PGP, PGP Ultra, I-20, PGJ, and SRM product lines, this tool is a valuable addition to any home or garden watering equipment collection. Made in the United States, this Hunter key wrench adjuster is a reliable and convenient tool for keeping your lawn sprinkler system in top working condition. Pre Owned with Free Shipping.