Mechanical filters clean water before entering the pump, ensuring your pump runs more efficiently and effectively, with less maintenance. Helps keep debris from entering pump and fountain nozzle or biological filter. Two easy to clean filter pads, one coarse and one fine. Filters water before entering pump. 8-inch stem with adapter for use with fountain heads. Compatible pumps models 566718, 566608, 566611. Compatible fountain nozzle models 566267, 566240, 566518. Measures 12.3-inch length by 6.25-inch width by 5.75-inch height3 year warranty.