Rainbird Root Watering System with 1401 Bubbler on Riser with Grate and Open Swing Assembly, 18" 4 in. (10,2 cm) retaining cap and vandal resistant locking grate tops a 36" (91,4 cm) semi-rigid mesh tube Factory installed swing assemblies with a 1401 (0.25 gpm; 0,95 l/m) bubbler on a fixed riser makes connecting to lateral lines easy Optional sand sock is ideal for use in sandy soil - Check valve - Right size for shrubs Minimizes transplant shock - Directs water to root ball and adjacent soil - Supplements top-down soaking Quicker tree and shrub growth - Provide a stable foundation against high winds - Reduces waste due to run-off