This 4-pack of tree watering rings solves the weekly hand-watering chore for new tree plantings and drought-stressed mature trees. Each ring holds 16 gal / 60.6 L and releases evenly over 6 to 9 hours—delivering the slow, deep root-zone hydration that newly transplanted trees need to establish strong taproots and that mature trees need to survive hot-summer droughts. One fill-up replaces a week of hand watering per tree, so a 4-tree install job needs one trip per week to top off. The wide 1.18 in / 30 mm fastener-cap inlet fits standard garden hoses up to 1 in / 25.4 mm OD, so fill-up takes seconds. Slow-release drip valves distribute water evenly around the trunk without clogging from dirt, mulch, or root debris. The 4-pack covers a small orchard row, a landscape crew's fresh ornamental install, or a tree-lawn replanting—fits trunks up to 5.51 in / 140 mm and tree heights from 5.91 in / 150 mm, so it works for saplings through mid-size trees. 520 gsm weather-resistant PVC resists tearing, punctures, and branch-rub damage—rings stay intact when filled to capacity and when wind shifts the canopy. UV-stable for full-season outdoor use without the plastic-crack failures of economy bags. Reusable and refillable, so the same 4-pack rotates through an orchard all summer. Set 4; 16 gal / 60.6 L each; net 5.73 lbs / 2.6 kg; PVC 520 gsm; trunk ≤5.51 in; min tree 5.91 in; hose 1 in / 25.4 mm OD. Model TWB-16gal-W4.