Wall Hydrant Complete Service Kit, Includes Service Repair Parts For The Mansfield Style 300, 400 & 500 Series Anti-Siphon Wall Hydrants & The Prier Original & Diamond 400 Series Anti-Siphon Wall Hydrants, Includes Seat Washer & Screws, Packing Washer, Left & Right Hand Packing & Packing Nuts, O-Rings & Backflow Preventer, Replaces All Wear Parts On 300, 400 Or #500 Series Stems, Does Not Include Copper Stem.