Pentair 145240 Tagelus Top Mount Fiberglass Sand Pool Filter, 4.9 Square Feet, 100 GPM, with Clamp-Style Multiport Valve Special lateral design provides superior flow characteristics and long filter cycles for economical operation Maximum Operating Pressure 50 psi Combination water and sand drain makes servicing and winterizing fast and easy 40, 50, and 60D models standard with plastic clamp