Pentair 27001-0060S Cord-Ring Replacement Sta-Rite Pool/Spa D.E. and Cartridge Filter &ndash; PRE - 1997 Cord ring replacement Fits Pentair Sta-Rite System 2 modular pool and spa D.E. filter model PLD50-DE Also fits Sta-Rite System 2 modular media pool and spa cartridge filter models PLM100, PLM150 Measures 16-inch length by 3/8-inch height by 16-inch width This product only fits "PRE-1997" Models of filters listed