Under the name CO2 Diffuser Ultra, Dennerle offers a series of highly advanced CO2 injection devices. The diffusers are made of transparent, shatterproof acrylic. This makes them significantly safer to handle than conventional glass diffusers and ideal for children's aquariums, for example. Due to their ultra-compact design, they can be installed invisibly in the aquarium using the included suction holder. However, even in visible areas, they do not appear intrusive thanks to their attractive design.