This filter cartridge is suitable for in-ground pool filters. The Pleatco PA106-PAK4 model is a reliable and efficient choice for keeping your pool clean and clear of debris. It is designed to work with Pleatco brand products and is easy to install.Please note that this item has been cracked, but maybe fully functional still. It comes with a 4-pack of filter cartridges, making it a great value for your money. Whether you're a professional pool cleaner or a DIY enthusiast, this filter cartridge is a great addition to your pool equipment.