For 50 year, fishkeeping enthusiasts have looked to the Tetra name for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need–-from a large variety of quality fish food and innovative equipment to test kits and decor. Tetra is a name you can trust in the aquatics industry. With decades of proven performance and high quality products it’s no wonder Tetra is the go to brand for aquatic beginners and veterans alike. The Tetra Replacement Foam Cylinder Prefilter is for use in ponds and with water gardens. This Cylinder Foam Prefilter measures 6" length by 4" diameter with a 1" diameter hole in center. 1 prefilter foam included in pack. For use with Tetra Water Garden Pump Pre-Filter. Utilize this replacement part to keep your filter functioning properly. Look at other TetraPond products to create an oasis all your own.