The Air Relief Valve Assembly Kit is a high-quality replacement part designed specifically for AquaPro above-ground pool cartridge and diatomaceous earth (D.E.) filters. Compatible with AquaPro 120, 190, 200, and 250 Cartridge Filters, as well as D.E.72 and D.E.40 filters, this kit ensures seamless fit and performance. It includes all necessary O-rings and components for easy installation and reliable use. Made from durable materials, this assembly helps maintain optimal filter performance by efficiently releasing trapped air, and its straightforward installation process allows for hassle-free replacement without needing professional assistance.