the aeration disk is composed of nano oxygenation pipe and impregnated steel support. the bracket is waterproof and not easy to rust,at the same time, the installation method is convenient. Just need put it into the fish pond.
Operating pressure 15kpa blasting pressure 30kpa 
Service life: fresh water 3 years, sea water 2 years
We have two size:

(1)diameter: 50cm, height: 16cm

(2)diameter: 80cm, height: 16cm