Fits filtration system housings that accept 20 x 4.5 inch cartridges;Bonded Polypropylene Filter Media;Ideal for City & Well Water Application;Actual Size: 20 1/8 inches (length) x 4 1/2 inches (outside diameter);Comparable to: Pentek DGD-5005-20, Hydronix SDC-45-2005, & AquaPure AP810-2