This hard plastic return jet allows for easily routed water from 3/4" ID tubing attached to your filtration system back into your aquarium. It may fit aquariums with a frame up to 1.5" wide. Eshopps’ Return Jet is ideally for freshwater or marine setups. Measures 3/4 x 3.25" x 5.75" overall; return nozzle measures 1.75" x 1-7/8" x 5/8" thick with a 1" diameter swivel ball joint.