Pentair 27001-0051 Safety Latch for Ring Replacement for select Sta-Rite Pool and Spa Filters Safety latch for ring replacement Fits Sta-Rite PLM pool and spa cartridge aboveground filter System Also compatible with Sta-Rite PLD pool and spa D.E. aboveground filter system Fits with Sta-Rite System 2 Modular Media PLM series pool and spa cartridge filters model PLM100, PLM125, PLM150, PLM175, PLM200, PLM300 Also fits Sta-Rite System 2 Modular pool and spa D.E. filters which have PLD Series model PLD50 - DE, PLD70 - DE