You must not have a PFE3 then. The biowheel for it would be 6.75 x 2.5 inches. The only one that I know of that may be larger would be the Magnum 350 bio wheel or the Bio Wheel Canopy one. I suspect you don't have a canister filter, so either you have the Bio Wheel Canopy or you are missing the bearings on yours. Perhaps you should take a picture of your system, and email it to us. Also, the model name/number is molded onto the pump/filtration assembly.
Date published: 2016-06-14