The Filter Tank Body/Valve O-Ring is a vital replacement part for AquaPro above-ground sand filter systems, specifically designed to fit AquaPro 19" and 24" sand filters. Constructed from durable synthetic rubber, this O-ring provides a long-lasting, leak-free seal, ensuring optimal performance of your pool filtration system. By creating a secure seal between the filter tank body and the valve, it helps prevent leaks and maintains the efficiency of the filtration process.