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The Filbur FC-4020 is the correct compatible replacement for the following pool and spa filters:
The Filbur FC-4020 Doughboy 90 sq ft Pool & Spa Filter is made of 90 square feet of Reemay spunbound polyester media. This Doughboy spa filter contains end caps that are made from durable polyurethane material. The center core of this FC-4020 spa filter is made of punched PVC pipe for consistent flow.
The Filbur FC-4020 specifications: