Replacement air filter for Titan Industrial Generators, models 7500,8000,8500,9000. Filter consists of 2 x 15mm elements, one fine pore filter (which installs nearest to carburetor) and one large pore filter that goes on top. May fit other models: CHECK DIMENSIONS PRIOR TO ORDERING. There's a lot a variability in airbox design on these model and several sub-models. Filter measures 4 1/2" x 6 1/4" x 15mm (30mm total stack height) Filter is shipped un-oiled; add 1-2 cap fulls of oil to the filter and squeeze/work it for a minute in the supplied bag, then install.