Lifegard Aquatics ARP270852 Ball Socket Nozzle for Aquarium Filter, 3/4-Inch to 3-Inch Lifegard aquatics ball socket 3/4-inch to 3-inch nozzle Each socket can come apart and snap back together and there are y fittings and special nozzles to fit on the end of the assembly Presenting a complete line of proven quality items for the advanced aquarist