Orbit 57250 2-Valve Heavy Duty Preassembled Manifold Unit has 2 Valves Installs in minutes with no tools required Expandable to a 4 valve manifold using Orbit part #57184 Works with PVC and Poly pipe systems; adapters for 3/4" and 1" pvc pipe included Designed to fit the Orbit Valve Box Base #53230 Unit has 2 valves Installs in minutes Hand tighten; no tools required Works with pvc and poly pipe systems; adapters for 3/4" and 1" pvc pipe included Works with most existing sprinkler systems