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The Filbur 30-77811 fits the following:
The Filbur 30-77811 1 Micron Absolute Pool/Spa Filter is made of high quality, durable pleated polyester media. This Filbur pool filter cartridge replacement features end caps made of Plastisol. This Filbur pool filter replacement filters particles down to 1 micron to keep your pool and spa water clean and crystal clear. This 1 micron absolute pool water filter has a diameter of 7 3/4 inches and a length of 30 3/4 inches.
The Filbur 30-77811 specifications: