PENN PLAX Large 5" Bubble Disk (2 Pack) and 20 Feet of Deluxe Silicone Flexible Airline Tubing for Aquariums 3/16-Inch 2 Bubble Disk and 20 Feet of 3/16 Air Line Each Bubble Disk can be connected to your air pump and tubing (Included) using the standard 3/16" tubing connection Flexible silicone tubing that stays soft & flexible without kinking Provides a continuous tower of bubbles to help aerate your aquarium Durable plastic can be buried or hidden to add to your dcor