Sturdy and Durable: In addition to harmful end caps and straps, it also has anti-crack and anti-corrosion functions. The matched filter material extends the service life, has a high dust storage capacity and effectively removes rubbish and strange smells.More cartridge pleats mean improved filter capacity. Filter Elements Size: Length: 13 5/16 inch; Outer diameter: 5 inches; top hole: 2 1/8 inch; bottom hole: 2 1/8 inch. It's a great alternative filter for hot tubs and spas.Our spa filter can deliver lower pressure and higher flow rates, causes less pump wear, and also uses less energy than other filter cartridges, so it ensures a longer life of the product. Compatible with the following components: Compatible with Unicel C-4950, 413-212-02, PRB35-IN, C-4335, -2385, R173431, 817-3501, 03FIL1300,Filbur -2390, Jacuzzi J200 Series Filter, 17-2380, 373045, 817-5000, Aladdin 15002, 25391, 03FIL1600, PLE. 051 0088, 435-0037, R173434, 06-0012-12, SD-00201, SD-00455. The product is not sponsored, endorsed or associated with the including , Unicel, , Filbur, Jacuzzi, Aladdin. The filter material of the Trilobal Fabric Structure makes it easier to remove contaminants when cleaning the filter. The filter is like a new one after cleaning. It is recommended that the cartridges be cleaned every 2 weeks to keep your spa performing. Long Lifespan: Thickened filter cloth, heavy duty anti-chlorine and breakage end caps, reinforced center core and durable washable pleated fabric make the whole filter elements longer lifespan and can be reused, saving money.This spa filter can effectively remove hair, leaves, sand, stones, dust, impurities, sediments, etc, with high efficiency and powerful filtering. Colour:blue Material:plastic Size:125 x 335mm Package Contents: 2 x whirlpool filters Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.