Pentair Black Filter Housing, 4.5" x 20"

The Pentair (4.5 × 20) Filter Housing is engineered for high-capacity water filtration applications requiring extended cartridge life and strong flow rates. Its large-diameter design accommodates 4.5″ × 20″ Big Blue-style cartridges, making it ideal for whole-house, commercial, and light industrial systems. Featuring a heavy-duty black sump and reinforced grey cap, this housing provides long-term durability and excellent chemical resistance. The top-seated Buna-N O-ring ensures a secure, leak-free seal, while the 1″ FNPT inlet and outlet connections support higher flow applications with minimal pressure drop. Features: Large 4.5″ × 20″ Big Blue-style housing Heavy-duty black sump with reinforced grey cap Top-seated Buna-N O-ring for reliable sealing 1″ FNPT inlet and outlet connections Compatible with extended-life filter cartridges Durable polypropylene construction Ideal for residential, commercial, and high-flow filtration Specifications Component Type: Single-Cartridge Filter Housing Diameter: 4.5 in Length: 20 in Housing Material: Polypropylene (Black Sump / Grey Cap) O-Ring Material: Buna-N Maximum Operating Pressure: 90–100 psi (Typical) Operating Temperature Range: 40 °F to 125 °F Color: Black / Grey Application: High-Capacity Water Filtration