Pentair 420 SqFt Clean & Clear Plus Tank Lid

The Pentair 420 SqFt Clean & Clear Plus Tank Lid (part number 178581) is a high-pressure primary containment dome engineered exclusively for maximum-capacity residential and commercial pool or spa filtration systems. This genuine almond-colored (tan) replacement upper hull is standard hardware tailored specifically for the Pentair Clean & Clear Plus 420-square-foot multi-element cartridge filter model (CCP420), while also doubling as the exact structural lid configuration for the Pentair Quad D.E. 80 filtration vessel.

Injection-molded from heavy-walled, fiberglass-reinforced polypropylene, this deep-domed basin functions as the upper pressurized seal for the entire cartridge core architecture. Its primary operational role is to safely enclose the internal matrix of four vertical cartridge elements (or D.E. cartridges) and provide a structural stabilization barrier against internal fluid dynamics. The exact peak of the dome features an integrated threaded port designed to house the system's high-flow manual air relief valve and pressure gauge assembly, allowing trapped gases to rise cleanly to the highest apex of the tank for safe evacuation. The bottom perimeter of the lid features a thick-walled mating flange engineered to rest precisely atop the main tank body O-ring and lower basin, creating an absolute watertight and airtight compression boundary when locked securely by the system's heavy-duty tension control clamp kit. This robust engineering enables the large-format pressurized vessel to easily manage high-velocity hydraulic circulation and safely sustain continuous internal operating pressures up to 50 PSI without weeping, structural flexing, or risking catastrophic lid separation under severe pump startup surges.

Built to withstand decades of harsh outdoor equipment pad weathering, direct sunlight UV exposure, and intense shifting seasonal temperature cycles, its advanced composite matrix completely resists material softening, stress-cracking, and corrosive degradation from direct contact with highly concentrated chemical sanitizers like chlorine, bromine, and salt-chlorine generator outputs. Due to its large-diameter, heavy-gauge reinforced polymer construction required to span a broad containment profile, this individual replacement tank lid carries a net product and shipping weight of approximately 18.75 to 22.00 pounds.