The RZWS are underground bubblers suitable for delivering water and oxygen directly to the roots, without water loss, without risk of vandalism. 3 models are available: for small plants to large trees with built-in bubblers, cover. The 90cm version has a standard Hunter swingjoint 1/2'' for quick placement and height adjustment. The RZWS have internal water distributors for better irrigation and sturdier whole. Ideal for municipalities, parks, large trees... Options: sand protection sleeve, anti-drain valve pressure compensating bubbler (standard 0.9 l/min)