Hayward DEX2400K Micro Clear, Pro Grid, SwimClear, Super Star Clear Filter Tank O'ring Replacement O-108 Hayward DEX2400K Micro Clear, Swimclear, Pro Grid, Super Star Clear Filter Tank O'ring Replacement O-108 Quality TORK Replacement parts O-108 Micro Clear, Swimclear, Pro Grid Perm-A-Glass Be sure you remove any dirt and debris from lid threads and use proper lube (not Petroleum) before use Buyer must install correctly, improper installation will result in leakage around cap