Pentair Water - Housing, Filter, BLK/GRY, 4.5" X 20", SGL O-Ring, NPR, 1" FNPT, SFH45, Pentair

Brand: Pentair Water

Pentair Big Grey Filter Housing, 4.5" x 20", 1" FNPT

The Pentair Big Grey 20" Water Filter Housing is a large-capacity housing built as a cost-effective alternative to low pressure stainless steel vessels. It accepts standard 4.5" diameter x 20" cartridges and is constructed of reinforced polypropylene for broad chemical compatibility.

Big Grey housings are well suited to high-flow and heavy-sediment applications and reduce the number of vessels required at high flow rates. The black cap and grey sump are compatible with a wide range of cartridges and chemicals across residential, commercial, and industrial water treatment installations.

Available Options

• 4.5" x 20", 1" FNPT, black cap / grey sump, single O-ring, no pressure relief (SKU )

Key Features

• Reinforced polypropylene construction
• 1" FNPT inlet and outlet
• Accepts standard 4.5" x 20" cartridges
• Single O-ring seal
• No pressure relief (NPR)
• Large-capacity design for high-flow and heavy-sediment service
• Substitute for low pressure stainless steel vessels
• Excellent chemical resistance

Why Choose the Pentair Big Grey Housing

Big Grey housings deliver large-capacity filtration without the cost of stainless steel vessels, and the reinforced polypropylene body handles a broad chemical range. The extra capacity reduces the vessel count required for high-flow installations.

Ideal Applications

• Whole-house and commercial water filtration
• High-flow sediment and carbon filtration
• Industrial process water pre-treatment
• Heavy-sediment well water
• Pre-filtration for RO systems and softeners