MTD-300 | Matala® Non-Weighted Tube Diffusers
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. These must be filled with rocks or gravel in order to be weighted down. 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.