Laguna Pressure-Flo Lid O-Ring for Pressure-Flo 700,1400,1000,2000 UVC Filter and Pressure-Flo Clean 700, 1400 Genuine Replacement O-Ring for Laguna Pressure-Flo 700,1400,1000,2000 and Pressure-Flo Clean 700 and 1400 Fits Laguna Pressure-Flo Model numbers PT1500, PT1502, PT1725, PT1726, PT1741, PT1742 Simple to replace Creates water tight seal, Product is a single O-Ring