Matala Hakko Air Tube Diffusers are designed to be a drop-in system. The rubber membrane is wrapped around a hollow PVC tube. The air holes are a little larger than other brands, so you get medium-sized bubbles which do not clog and put very little back-pressure on your system. This means very low maintenance and effective aeration system. These must be filled with rocks or gravel in order to be weighted down.
The MTD-300 and 600 are 12" long and 24" long. These are hollow 2.6" diameter tubes with a rubber membrane wrapped around the outside. The MTD-300 and 600 come with an end plug and a multi-barb adapter so you can connect with various hose sizes from 3/8", 1/2", 5/8" or 1.
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