Bright Green COLL-T Grovert Water Collector, 8.5 by 2.25 by 4.25-Inch, Black Designed to be used when the Bright Green BG-8 are within a frame Fits underneath the GroVert Living Wall Garden Panel Collects extra run-off created as you water your planter Collector tray snaps to the panel and allows you to plant vertically indoors Measures 8.5 x 4.25 x 2.25 Inch