BPENN PLAX Add-A-Stone Air Pump Accessories, 10-Inch by 2-Inch ReviewbP PP PENN PLAX Add-A-Stone Air Pump Accessories, 10-Inch by 2-Inch PProvides a continuous tower of bubbles to help aerate your aquariumPDurable plastic can be buried or hidden to add to your d�corPUses a standard 316" tubing connectionP