Tapered Reservoir fits in our tapered liners and window boxes but also works well with rectangular boxes. Constructed out of durable plastic, the water naturally wicks up from the reservoir as needed. This reservoir has raised tabs on the bottom so if the planter is over-watered, or top watered, it can drain from the drainage holes. The water feeder inlet has a stop ring the holds the feeder tube perfectly, allowing maximum water fill. Holds approximately 1.6 gallons of water.