The EHEIM Air Pump 400 Aquarium Aerator will keep your aquatic amigos happy， healthy and well oxygenated! Designed for ultra-quiet performance， it is suitable for use in either freshwater or saltwater aquariums up to 120-gallons in size. It has an output of 53-gallons-per-hour (105 gph combined)， using only 4-watts， with two adjustable air outlets and two diffusers. Installation on any aquarium wall is easy using the mounted suction cup or use the handy eyelet for wall mounting. Rubberized corners， feet， and a diaphragm shell eliminate unwanted shifting， movement， vibration and noise， while the six-foot， seven-inch maximum depth rating means it is capable of powering everything from air stones and bubble walls to ornaments and protein skimmers.