The 2-Liter TREE DEFEND® with Brass Valves is set up for trees up to 26" in diameter and is ideal for doing larger volume injections (or multiple, consecutive trees). It includes a 2-Liter Reservoir with Built-in Air Pump and Pressure Gauge, (12) Brass Valves, (12) Injector Tubes, and a Dual Outlet. To expand for a larger tree, purchase our Extra Tubing Section.