Encompass All Return Jet Assembly with Directional Return Industrial grade plastic return jet allows user to easily route water from 3/4" ID tubing from the filtration system back into the aquarium. The return jet is designed for freshwater or marine aquariums. It may fit aquariums with frame up to 1.5" wide Approximate Dimensions are 3/4"x3.25"x6" Nozzle: 1.75" *IMPORTANT INFORMATION: There's a small pin hole located above the swivel/nozzle. This pin hole is break siphon in the event of a power outage or if the pump shuts off, which will prevent water from siphoning.