About This [REPLACEMENT MODEL] Replacement for WF3CB, 706465, 242069601, 242086201, 242017800, PS3412266, AP4567491. [NOTE] You'll notice the central plastic piece different from the OEM. While this might raise concerns initially, I encourage you to try it out – you'll discover it inserts effortlessly and operates seamlessly. [USEFUL LIFE] For peak efficiency of your filtration system, it is recommended to remove approximately 4 gallons of water before the initial usage. Enjoy fresh by replacing every 6 months or 200 gallons, whichever comes first. [NSF CERTIFICATION] Certified and tested to NSF/ANSI 42 standard to reduce chlorine, odor and retain beneficial minerals in your water. [EASY REPLACEMENT] Easy for installation and operation, without water leakage and connection issues. Overview Material : Carbon Block Product Dimensions : 2.6"D x 2.6"W x 9"H Item Weight : 12.48 ounces External Testing Certification : ANSI, NSF Product Benefits : Reduces Chlorine