GRAVITY FED DESIGN - This water container provides water flow at a constant rate using its complete gravity-fed design with a 1-gallon capacity. HIGHLY DURABLE - This water tank is made of heavy-duty polystyrene that is designed to withstand heat, cold, and cracks. EASY ASSEMBLY - The water dish base can be easily assembled and disassembled with the container using its simple screw on design. TRANSPARENT JAR - The water jar is molded from durable transparent polyethylene so the water level is always visible.