Clayton Mark 5451 Hydrant Head 2575K Complete Head This Head Also Works For Models That Have 2506K On The Handle. It is important when replacing the head that you loosen the packing and linkage before using pipe wrenches to unscrew the head so you do not unscrew the long rod from the plunger at the bottom. Clayton Mark 5451 Hydrant Head 2575K. The clevis rod does come with the new head. The head comes just as pictured.