Filbur DE Grid Set [Pentair Hayward, 12", 24 sq ft, 7 Full + 1 Half] (FC 9520) pulsafeeder The Praher TM 12 S8 multiport valve The Praher TM 12 S8 multiport valve is a 1 1 2 inch female threaded replacement designed for compatible filtration systems that need dependable central routing control A proper platform match keeps the repair cleaner and helps restore the operation the spa was designed to deliver from the start The Filbur FC 9520 DE grid set is designed for compatible Pentair and Hayward DE filter systems and includes 7 full grids plus 1 half grid in a 12 inch Grid sets are especially valuable during larger service jobs where the whole internal assembly has aged together and a matched replacement is the cleaner long term solution