The AquaVita Air Pumps are great for adding oxygen to aquariums and hydroponic systems when used in conjunction with an air stone, especially AquaVita Air Stones. These super quiet pumps feature a double diaphragm for long lasting reliability. All models have a 5’ power cord and require a 3/16X, inner diameter hose size. 1 year manufacturer’s warranty. 4 Outlet Air Divider Included