6 Guardian Pool Spa Filter Replaces Unicel C-4950 Prb50-in Jacuzzi Cartridge -Bottom Opening: 2 - 1/8" -Top Opening: 2 - 1/8" -Outside Diameter: 4 - 15/16" (Also replaces 5") -Length: 13 - 5/16" -REMAY Filter media Meets or exceeds OEM quality!! 50 sqft UNICEL C-4950 PLEATCO PRB50 Guardian filtration product