Compatible ModelsHeight 13 5/16; Outside Diameter: 5; Top Hole: 2 1/8 Open; Bottom Hole: 2 1/8 Open. Compatible with PRB25-IN, Unicel C-4326, Filbur FC-2375, 3005845, R172327, R173429, 33521, 25392, 817-2500. Easy to CleanBenefited from innovative and high-performance Trilobal fabric Design, PELLUCID spa filters are easier to capture and release dirt, so you can always keep your pool and spa clear and safe for you and your family. It is recommended that you can scrub every 2 weeks the fabric with a cartridge cleaner tool and rinse it with a garden hose. Premium MaterialWe're committed to creating affordable, high quality pool filters to ensures safe and healthy pool water. The filter fabric material is innovative Trilobal filter material for handling water contaminants on a higher level hardly comparable. The End Caps is made from durable, chemical resistant compounds. And the backbone constructed of high quality carbon fiber is solid one-piece construction for structural integrity. Advanced Filtration PerformanceKeep your pool water clean and clear with the help of this high quality pool filter cartridge. Better than other regular fabric, our innovative Trilobal fiber provide maximum dirt holding capacity, high efficiency filtration system,and excellent chlorine Resistance. Efficiently removes hair, leaves, dust, sediment, sand, etc.Just enjoy fun time in your pool. Longer Life with Sturdy CoreMade of premium carbon fiber which is lighter and stronger, the backbone provide greater structural integrity for longer life. Never worry about being crack during normal use. Once you get our on-budget hot tub spa filter you will use them for months to come with satisfaction.