The Hayward Auto Air Relief Tube C1100/C1200/C1502 S311 is an essential component for maintaining optimal performance in your Hayward filters. Designed specifically for Pro Series S244S and Pro Series Plus S311 sand filters, as well as StarClear II C1100 and StarClear Plus C1200 series cartridge filters, this air relief tube ensures efficient air release to enhance filtration efficiency. With its durable plastic construction, the Hayward CX1100Z4 offers reliable and long-lasting performance. Ideal for pool owners looking to maintain a clear and clean swimming environment, this replacement part is easy to install and helps prolong the life and effectiveness of your filtering system.