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made from high quality plastic and can increase the outflow from the filter outlet by up to 400%. This increases the overall circulation in the aquarium, minimising deadspots. The best part about flow accelerators is that they increase flow, without any additional electricity consumption or added heat. These Vortex Flow Accelerators are available in three BSP sizes; 1/2", 3/4" and 1". Easy to install - just screws in.