We offer Professional Air Diffusers that can be used to drop right into a pond or that can be used for bottom drain modifications. The Air Tube Diffusers are heavy duty and can be weighted down by putting small pebbles or stones on the inside of the tube. Our 5" and 9" Air Discs Diffusers are fitted with 3/4" Female Pipe Threads allowing you to customize your own air system or bottom drain. You can expect small efficient air bubbles, low maintenance and longevity with these professional air diffusers.