The new shape of silence. The patented dome shape and sound dampening chambers minimize turbulence and produce a smooth quiet stream of air. Wide footprint, rubber feet and suspended pump motor eliminate sound producing vibrations. Thick walls insulate motor noise. Powerful diaphragms provide ample airflow for deep water applications. Each air pump is covered by a manufacturer's limited two-year warranty. Pumps are 115V 60Hz and UL-approved for both fresh and marine water. Uses standard-size aquarium air tubing (not included). Made in China.