Busy gardeners love the Plant Sitter system. It delivers water to your plants based on the soil's dryness. Each Plant Sitter includes a small water tank that hangs on the side of your pot, and one 4-1/4" H x 1-1/2" diameter ceramic cone with 18-1/2" siphon tube. Additional cones with watering tubes are sold separately. Large planters may require two or more cones Reads soil dryness so plants are never over- or under-watered A Vacation Watering Solution! Plant Sitter includes a 1-quart contoured water tank and 18-1/2" siphon tube with ceramic cone Additional watering cones sold separately