Specifications: Length:3 3/4", outside diameter:4 1/4", top/bottom:2-1/16" open, filtration area:2.5 sq.ft. Filter material: trilobal filtration fabric. Replacement Filter: Get cleaner water in your pool or spa with these replacement cartridge filters compatible with C-4313, Filbur FC-3753, PBW4PAIR. Alternate filter name:TYPE D, 404-120. Reinforcement Structure: With thickened trilobal fabric, heavy chlorine and break resistant end caps and reinforced center support, the filter provides high power propulsion flow and crystal clear water for your relaxed and healthy enjoyment. Powerful Filtration Performance: Uniformity and high-performance trilobal fabrics have a higher capacity than ordinary bonded fabrics. The trilobal shape of the fabric fibers also helps capture particles, increases efficiency without causing pressure drop loss, and helps reduce the frequency of filter cleaning. Easy to Clean: We suggest to rinse your spa filters regularly with clean water, this will help remove dirt and protect your filter material. With regular cleaning, the filter also needs to be replaced regularly to make your spa filter work more efficiently. Brand NEW 2 pack. Shipping is only to the lower 48 states, USA. But? If you are outside the USA you may purchase if your country participates in's Global Shipping Program. Bid with confidence; we are Experienced sellers for over 23 years. Ships from Washington, DC. Tracking included in ALL orders. NO local pick-up option. Preguntas? Adelante! Hablamos Español. (CA010)