Pentair 520 SqFt Clean & Clear Plus Tank Lid

The Pentair 520 SqFt Clean & Clear Plus Tank Lid Assembly (part number 178582 or 178582Z) is a rugged, heavy-duty structural pressure vessel dome engineered exclusively for the upper chassis of maximum-capacity Pentair Clean & Clear Plus 520-square-foot cartridge filtration systems (model CCP520), as well as compatible Pentair Quad D.E. 100 filters. Injection-molded from a thick-walled, fiberglass-reinforced polypropylene composite, this almond-tan enclosure dome serves as the entire top half of the filter tank. Its primary structural role is to seat precisely over the internal cartridge collection manifold and lower tank shell, compressing the main perimeter O-ring to form an absolute airtight and watertight containment seal when locked down by the main tension clamp ring. This heavy-gauge structural architecture enables the high-capacity filter to safely manage massive water distribution volumes and sustain continuous internal hydraulic operating pressures up to 50 PSI without flexing, weeping, or risking sudden structural blowout under intense pump vibration surges.

The crown of the lid features pre-molded, integrated thread ports designed to securely accommodate the manual High Flow™ air relief valve assembly and pressure gauge at its highest point. Built to withstand decades of demanding outdoor equipment pad weathering, this robust composite shell completely resists intense UV degradation, extreme seasonal temperature shifting, and highly corrosive pool environments containing concentrated chlorine, bromine, or salt-chlorine generator outputs. Due to its expansive profile and thick-walled composite reinforcement engineered to withstand heavy internal forces, this individual upper tank lid carries a net product weight of approximately 17.4 pounds (with a shipping box weight that can range higher depending on packaging configurations).