If you have an open litter box (EcoGranda or EcoMinor) and would prefer a closed one (EcoDome or EcoHûs), yes, you can. You can replace the rim with a hood. The base is identical. The hoods for the EcoDome and EcoHûs are available separately. Do check that a flap and filter are also included and, for the EcoDome, a handle and a set of clips.