Thrifco Plumbing 8429954 Automatic Yard Watering Kit Valve 58874N. The Extra Valve is an additional valve for your existing Orbit Complete Yard Watering Kit with part numbers 58872 and 91591. This easily turns your 4-station yard sprinkling system into a 5-station sprinkling system. Designed so you can mount your Orbit Hose Faucet Timer to the front of the valve. Built with high quality materials, and waterproof construction, so you can count on many years of dependable use.