Sta-Rite System 2 Filter Tank O-Ring O-484 27001-0061S 2009-Current Cord Ring (27001-0061S) used on the following Sta-Rite filters: . PLM & PLD System 2 Modular Media & Modular D.E, System 2 Modular D.E. PLDE Series Quality Professor Foam Aftermarket replacement part PLM filters 2009 - current