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.