Length: 13-5/16" Diameter: 4-15/ 16'' or 5" Top opening: 2-1/8" Bottom opening: 2-1/8"   Built to meet OEM specifications, the Guardian 413-212M features: 50 sq. ft. of high quality filtration fabric  Exclusive Expansive Flow™ core Break-resistant Guardian banding Replaces popular brand part numbers: Unicel C-4950RA Filbur FC-2390M Pleatco PRB50-IN-M Alternative filter names: Rainbow Dynamic 50, 03FIL1600, 100533, 6540-471, 25391, R173434, 817-5000, 3005815, 3301-2145, 5001, Dynamic Series, RDC-50, RDC-50S, R173430, 17-3430, R1723807-2380, Series II & II, RTL-50, RCF-50, 17-175-1595, 73533,  212320, LE CIRQUE, 4900-41, Series IV DFM, Series IV DFML, 373045, 17-175-1596, APCC7150, 15002, PLRB50, PRB 50IN, PRB50-IN-Z   By Guardian Filtration Products • 413-212-M