Pentair 178656 Cartridge Replacement Quad 100 Pool and Spa D.E. Filter Cartridge replacement Straight, sharp and evenly spaced pleats for efficient dirt holding and capturing Durable polyurethane end caps for strength and proper sealing in filter tank Re-enforced center cores with a PVC center core for support Evenly spaced holes in center core for even distribution of water flow through the cleaning cartridge; measures 6-1/4-inch length by 32-3/4-inch height by 6-1/4-inch width