Check the listing for details. Aquarium Water Change Diffuser. Condition: New. Listed at 9.99 USD. Our handy Aquarium Water Change Diffuser will keep water flow at the surface and away from your substrate. Keep your tank looking great by protecting your sand, gravel, soil, and plants from being disturbed by downflow. Water flow exiting our Diffuser will keep it pinned in the corner of your tank, and our Diffuser floats on the surface, so you have your hands free for pouring. Made in USA with aquarium safe PETG plastic, the same plastic used for bottles of water. PETG has better impact and UV resistance than ABS and PLA. We buy our PETG filament from American manufacturers only. Your Pets deserve the best and safest products!Works great for both freshwater and saltwater fish tanks.Dimensions:Standard: 5.16 W x 4.69 L x 2.64 H inches (131 W x 119 L x 67 H mm) Small: 3.46 W x 3.11 L x 1.77 H inches (88 W x 79 L x 45 H mm)